Top 22 Apps Similar to Mate Facil (FREE)

"G-Calc" is an app that makes calculations for a varietyofgeometric shapes.

Geometry Pad is a dynamic geometryapplicationfor Android tablets with universal appeal. Teachers canuse it in ageometry class for better students engagement anddeeperunderstanding of geometric concepts. Students would benefitfromusing Geometry Pad while working on geometry assignments athome aswell. Easily create complex geometric sketches, measureeverythingyou have in your document, experiment with shapesandtransformations.Use following tools to sketch your geometry constructions:- Move and scale. Scroll the workbook by your finger. Pinch andzoomthe content of your workbook. Move and modifygeometricshapes.- Compass to create arcs.- Point. Plot a point on the workbook. Customize point nameandcolor.- Line. Create a line. Customize line style, color andstart/endpoints. Calculate line length (distance betweenpoints).- Midpoint for lines. Show/hide midpoint for lines andpolygonsides. Snap to midpoints.- Parallel, perpendicular and tangent lines. The lines canbecreated as easily as regular lines. Just create and move thelineuntil it automatically snaps to parallel, perpendicularortangent.- Angle. Create an angle with up to 1 degree precision.Customizeangle line style and color.- Triangle. Create a triangle of one of the predefinedtypes:regular, right triangle, isosceles, equilateral. Customizesidesstyle and color. Calculate triangle perimeter and area.Calculateinner angles of the triangle and length of itssides.- Triangle lines. Create altitude, bisector and median lines inatriangle. Calculate length of triangle lines. Customize linesstyleand color.- Quadrilateral. Create a quadrilateral of one of thepredefinedtypes: regular, square, rectangle, parallelogram,rhombus.Customize sides style and color. Calculate quadrilateralperimeterand area. Calculate inner angles of the quadrilateral andlength ofits sides.- Circle. Create a circle. Calculate circle perimeter andarea.Easily create circles inscribed into a triangle by placingcircle'scenter close enough to the incenter of a triangle.- Circle radius and chord. Create radius and chord lines foracircle. Customize lines style and color. Calculate the lengthofthe lines.- Polygons and regular polygons.- Arcs and circular sectors.- Ellipses.- Text annotations. Create floating and pinned single andmultiplelines text annotations. Customize text/background colorandtransparency.- Measurements tool. Measure shape properties in singletouch.Measure intersection points (line & line, line &circle).Use multitouch to measure distance between points and anglebetweenlines.- Transformation tools: rotation, reflection, enlargementandtranslation.- Manual input of coordinates, lengths and angles. Use manualinputto precisely locate points, setup custom length for a line orapolygon side, and change angle value.- Built-in calculator: basic arithmetic functions, square root,sin,cos, tan.Manage multiple documents with your geometric sketches atthesame time using Save and Load features. In addition, you cansharedocuments through e-mail or Dropbox.Some of the tasks you can solve with Geometry Pad:- Create geometric shapes and measure all its possible metricslikelength, angle, area, perimeter, intersections, distancebetweenpoints, angles between lines.- Move/resize geometric shapes and watch how its metricsarechanging in real time.- Demonstrate circle theorems by creating and changing inscribedandcenter angles.- Demonstrate theorems about incircles andexcircleslocations.- Create and annotate complex geometric figures. Share themthroughexport to image and e-mail features.

Application to calculate Area and VolumeArea Calculator to calculate1. Rectangle2. Parallelogram3. Square4. Triangle5. Circle6. Eclipse7. TrapezoidVolume Calculator to calculate1. Cube2. Cylinder3. Sphere4. Cone5. Pyramid6. Prism7. Cuboid8. TorusUnit conversion calculation function is also there.Area Volume and Conversion now offers FREE Caller id as anaddedfeature within the app.It identifies callers for you - even the ones not in yourcontactlist.No more Spam calls or guessing numbers on unknown phonecalls.Caller ID results are shown after calls and also allow you tosavethe contact details directly to your address-book.You also can take a note with one click from the CallerIDscreen.You can disable or adjust caller ID to your preferences inthesettings menu any time.

Mathematics calculator and formula for volume and surfaceareacalculate.

Fasten Tools - simplify your calculations

Calculate angles and sides of the triangle easy and fast ! ipar

Geometry Pad is a dynamic geometryapplicationfor Android tablets with universal appeal. Teachers canuse it in ageometry class for better students engagement anddeeperunderstanding of geometric concepts. Students would benefitfromusing Geometry Pad while working on geometry assignments athome aswell. Easily create complex geometric sketches, measureeverythingyou have in your document, experiment with shapesandtransformations.Use following tools to sketch your geometry constructions(*):- Move and scale. Scroll the workbook by your finger. Pinch andzoomthe content of your workbook. Move and modifygeometricshapes.- Compass to create arcs.- Point. Plot a point on the workbook. Customize point nameandcolor.- Line. Create a line. Customize line style, color andstart/endpoints. Calculate line length (distance betweenpoints).- Midpoint for lines. Show/hide midpoint for lines andpolygonsides. Snap to midpoints.- Parallel, perpendicular and tangent lines. The lines canbecreated as easily as regular lines. Just create and move thelineuntil it automatically snaps to parallel, perpendicularortangent.- Angle. Create an angle with up to 1 degree precision.Customizeangle line style and color.- Triangle. Create a triangle of one of the predefinedtypes:regular, right triangle, isosceles, equilateral. Customizesidesstyle and color. Calculate triangle perimeter and area.Calculateinner angles of the triangle and length of itssides.- Triangle lines. Create altitude, bisector and median lines inatriangle. Calculate length of triangle lines. Customize linesstyleand color.- Quadrilateral. Create a quadrilateral of one of thepredefinedtypes: regular, square, rectangle, parallelogram,rhombus.Customize sides style and color. Calculate quadrilateralperimeterand area. Calculate inner angles of the quadrilateral andlength ofits sides.- Circle. Create a circle. Calculate circle perimeter andarea.Easily create circles inscribed into a triangle by placingcircle'scenter close enough to the incenter of a triangle.- Circle radius and chord. Create radius and chord lines foracircle. Customize lines style and color. Calculate the lengthofthe lines.- Polygons and regular polygons.- Arcs and circular sectors.- Ellipses.- Text annotations. Create floating and pinned single andmultiplelines text annotations. Customize text/background colorandtransparency.- Measurements tool. Measure shape properties in singletouch.Measure intersection points (line & line, line &circle).Use multitouch to measure distance between points and anglebetweenlines.- Transformation tools: rotation, reflection, enlargementandtranslation.- Manual input of coordinates, lengths and angles. Use manualinputto precisely locate points, setup custom length for a line orapolygon side, and change angle value.- Built-in calculator: basic arithmetic functions, square root,sin,cos, tan.Manage multiple documents with your geometric sketches at thesametime using Save and Load features. In addition, you cansharedocuments through e-mail or Dropbox.Some of the tasks you can solve with Geometry Pad:- Create geometric shapes and measure all its possible metricslikelength, angle, area, perimeter, intersections, distancebetweenpoints, angles between lines.- Move/resize geometric shapes and watch how its metricsarechanging in real time.- Demonstrate circle theorems by creating and changing inscribedandcenter angles.- Demonstrate theorems about incircles andexcircleslocations.- Create and annotate complex geometric figures. Share themthroughexport to image and e-mail features.* Geometry Pad is a commercial product and some of its featuresareunavailable in the free version. A paid in-app unlock isrequiredto get access to the premium features (PremiumFeaturesPack).

Complete trigonometry reference

Easy maths formula platform for Engineering and others.

Will guide you how to solve your homework math problems,anytime,anywhere!

TensorCalc is a tool for working problemswithmatrices, vectors, tensors and coordinate system changes.Features:scalars: full function calculatormatrices: product, transverse, inverse, determinantvectors: direct product, dot product, cross product,contravariantand covariant representationtensors: index raising and lowering, Einstein summationnotation,metric, contractioncreate coordinate systems by either basis or Jacobianten registers

Fluid mechanics is an engineering app formechanicalengineeringstudents and professionals. The branch ofscience thatdeals withthe study of fluids (liquids and gases) in astate ofrest ormotion is an important subject of Civil, MechanicalandChemicalEngineering. The app covers full syllabusofmechanicalengineering. There are complete chapters, topicsandvideo tutorialwith easy explanation which makes the content easytounderstand.There are some important topics in the app whichareviscosity,Centrifugal Pump, properties of fluid, fluidmechanics,turbines,hydraulic turbines, fluid coupling, centrifugalpumps,pumpinstallation and centrifugal pump. Fluid mechanics dealswiththreeaspects of the fluid: static, kinematics, anddynamicsaspects: 1)Fluid statics: The fluid which is in state ofrest iscalled asstatic fluid and its study is called as fluidstatics. 2)Fluidkinematics: The fluid which is in state of motionis calledasmoving fluid. The study of moving fluid withoutconsideringtheeffect of external pressures is called as fluidkinematics.3)Fluid dynamics: The branch of science which studiesthe effectofall pressures including the external pressures on themovingfluidis called as fluid dynamics. Common Applications ofFluids :1)Hydroelectric Power Plants 2) Hydraulic machines 3)Automobiles4)Refrigerators and Air Conditioners 5) Thermal PowerPlants6)Nuclear power plants 7) Fluids as a Renewable EnergySource8)Operating Various Instruments 9) Heat Engines Some ofthetopicsCovered in the app are: 1. Energy Equation 2.GeneralIntroduction3. Momentum Transfer Principles 4. EulerTheory(Elementary) 5.Modern Theory of Turbomachines 6. Necessityfor flowunsteadiness7. Approximate calculation of deviation afterStodola8. SomePractical Considerations (Actual Machine Design)9.Coefficientsand Efficiencies 10. Dimensional Analysis11.Application ofDimensional Analysis on Turbomachines 12.PerformanceCurves 13.Reynolds Number Effect 14. Specific Speed 15.HydraulicTurbines16. Cascade Nomenclature 17. Lift and Drag 18. TheCascadesinMotion 19. Cascade Performance 20. Mach Number Effect21.IdealCharacteristics 22. The Head-Capacity Curve of aStraightCascade:23. Radial Cascade 24. Singularity Method 25.Method ofSolutionfor Single Airfoil 26. Conformal TransformationMethod27.Centrifugal Pumps (Radial) 28. Centrifugal PumpActualPerformance29. Brake Horsepower and Efficiency Curves 30.InfluenceofPhysical Properties on Performance 31. LeakageCalculation32.Mechanical Seals 33. Axial Thrust 34. ImpellerDesign35.Centrifugal Pump Types 36. Axial Pumps (Propeller Pumps)37.Studyof Flow Inside the Rotor (Radial Equilibrium) 38.PerformanceofAxial Flow Propeller Pumps 39. Pump Selection andApplications40.Design of the Intake Chamber of Vertical Pumps 41.PressureSurges(Water Hammer) in Piping Systems 42. PumpInstallation 43.ImpulseTurbines (Pelton Wheel) 44. ReactionTurbines 45. HeadDelivered byTurbine and Draft Tube 46. Types ofDraft Tube 47. SomeTurbinesInstallations 48. Fluid Coupling 49.Equation of state 50.Laws ofThermodynamics 51. Compression ofGasses 52. PlaneCompressibleFlow 53. Gothert's Rule 54. Fans 55.Head and Power56.Coefficients and Specific Speed 57. Radial TypeImpeller Design58.Reciprocating Pumps 59. Instantaneous Rate ofFlow 60. RotaryPumps61. Performance of Positive Pumps 62.INTRODUCTION OFPRESSURERECOVERY DEVICES 63. Diffuser Types 64.Vaned Diffuser 65.VoluteType Diffuser 66. INTRODUCTION OF THEORY OFCAVITATIONINCENTRIFUGAL PUMPS 67. INCEPTION OF CAVITATION 68.SIGNSOFCAVITATION 69. MECHANISMS OF DAMAGE Each topic iscompletewithdiagrams, equations and other forms ofgraphicalrepresentationsfor better learning and quickunderstanding. Fluidmechanics ispart of Mechanical, Civil, Chemicalengineeringeducation coursesand technology degree programs atvariousuniversities.

Math topics carefully written to make iteasyto understand math, calculators that give explanationsandintermediate results, and a collection of formulas. Doesnotrequire network access.Mathinary is a powerful educational math tool for studentsandparents who help their children with math.Mathinary contains formulas, explanations and calculators.Thecalculators give explanations, intermediate results andfinalresults. The calculators are simulating how a personwouldcalculate the result, by showing every step of thecalculationincluding descriptions.The topics in Mathinary are described with text, which hasbeencarefully written to avoid difficult words, and making itsimplefor students and their parents to understand math.Mathinary is an invaluable app for children in school, theirparentsand others who needs help with math or those who just wantstofreshen up their knowledge.Mathinary is concentrated on math in school from the 5th tothetenth grade, but is also covering topics used inhighereducations.Topics covered:* PLANE GEOMETRYAnnulus, circle, circle sector, circle segment, lines andpoints,parabola, parallelogram, polygon, quadrilateral,rectangle,rhombus, square, trapezoid, triangle, unit circle,vectors* SOLIDSCone, frustum cone, cylinder, parallelepiped, prism,pyramid,frustum pyramid, sphere* CONVERSIONSArea, currency, degrees and radians, length, scale, speed,timeperiods, time units, volume* FINANCEAnnuity loan, annuity savings, currency conversion, futurevalue,percentage, value added tax* Numbers & AlgebraAddition - long, binary numeral system, divisibility rules,division– long, exponents, fractions, linear equation,multiplication –long, order of operations, parentheses, quadraticequation, romannumerals, roots, sets of numbers, simplification,subtraction–long* FunctionsExponential functions, inversely proportional function,linearfunction, power function, proportional function,quadraticfunction* Probability & statisticsBinomial distribution, charts, combinatorics,observations,probability, set theory* TablesFractions / least common denominator, multiplication10x10,multiplication 12x12, multiplication 20x20* Math gamesMultiplication game, order of operations gameThe developers can be contacted within the app, in thesection“ABOUT” and then “Contact us”

EasySolve Triangle Calculator is a veryeasyand suitable application to solve and draw any kind oftriangles.With the application you can chose triangle attributes todraw -altitude, bisector, median inscribed or subscribedcircles.Triangles can be draw with the given three sides or withtwo sidesand an angle.

This free math calculator will instantlysolvethe Pythagorean equation. The Pythagorean Theorem statesthata²+b²=c² and can be used to find the length of the hypotenuseof aright triangle. Simply input the length of two sides and theappwill calculate the third side according to thePythagoreanTheorem.For example enter side A and sides B and the calculatorwillcalculate the length of side C.The best app for school and college! If you are a student, itwillhelp you to learn algebra and geometry!

The app is a complete free handbook of StructuralAnalysiswhichcovers important topics, notes, materials, news &blogs onthecourse. Download the App as a reference material &digitalbookfor Civil & environmental engineering programs&degreecourses. This useful App lists 110 topics withdetailednotes,diagrams, equations, formulas & course material,thetopics arelisted in 5 chapters. The app is must have for alltheengineeringscience students & professionals. The appprovidesquickrevision and reference to the important topics likeadetailedflash card notes, it makes it easy & useful forthestudent ora professional to cover the course syllabusquicklybefore an examsor interview for jobs. Track your learning,setreminders, edit thestudy material, add favourite topics, sharethetopics on socialmedia. Use this useful engineering app asyourtutorial, digitalbook, a reference guide for syllabus,coursematerial, projectwork, sharing your views on the blog. Someof thetopics Covered inthe app are: 1. Development of PlasticAnalysis 2.Interpretationof Stiffness Matrix 3. Truss ElementStiffness Matrix4.Introduction 5. Mohr’s First Theorem (Mohr I) 6.Mohr’sSecondTheorem (Mohr II) 7. Application to DeterminateStructures8.Finding Deflections 9. Application to IndeterminateStructures10.Find the location of the maximum deflection 11.ContinuousBeams:Introduction 12. Analysis of Continuous Beams13.Incorporation ofMoment Due to Reactions 14. Pressure Line duetoPrestressing Force15. METHOD OF CONSISTENT DEFORMATION:BasicConcept 16. Choice ofReleased Structures 17.CompatibilityEquations for General Case18. Vector of kinematicalconditions 19.METHOD OF SLOPE-DEFLECTIONEQUATIONS 20. Computationof Fixed-endMoments 21. THE MOMENTDISTRIBUTION METHOD 22.DISTRIBUTION FACTOR23. STEPS INVOLVED INMOMENT DISTRIBUTION METHOD24. Strain Energy25. Beams 26. Analysisof two-hinged arch 27.Influence line diagram28. Symmetrical twohinged arch 29.Temperature effect 30. Torqueand thrust force indrilling 31. MODELOF DRILLING 32. Introductionof SuspensionBridges 33. StructuralSystem 34. Design of suspensionbridge 35.Wind-Resistant Design 36.Design of Cable Section 37.FieldMeasurement and Coatings 38.Introduction of Stiffening Girder39.Design of Girder End 40.Fabrication Technology 41.ErectionTechnology 42. All-Hinge ErectionMethod 43.Moment-shearinteraction of longitudinally stiffenedgirders 44.EUROCODE DESIGNPROVISONS 45. FINITE ELEMENT MODELING 46.NON-LINEARFINITE ELEMENTSTUDY 47. Alternative Form ofSlope-deflectionEquations 48. SignConvention 49. Computation ofFixed-end Moments50.Slope-deflection Equations for Special Members51.Slope-deflectionEquations for Special Members 52. SymmetricmemberandAnti-symmetric member 53. Analysis ofStructuresbySlope-deflection Equations 54. End rotations and swayangleofmembers 55. Determination of sway angle by instantaneouscenterofrotations (ICR) 56. Set up equilibrium equations57.Equilibriumequations associated with sway degrees of freedom58.Equilibriumequations associated with sway degrees of freedomEachtopic iscomplete with diagrams, equations and other formsofgraphicalrepresentations for better learning andquickunderstanding.Structural Analysis & control is part ofCivil&environmental engineering education courses andtechnologydegreeprograms of various universities.

aMat Lite is the demo version of aMat. It is an ad-supportedversionand it does not have all the features that are avaiable inthe fullversion. aMat significantly simplifies math and geometrymaking themmore fun, especially for students in middle and highschools. Hereare some of the features aMat offers: • Calculate theperimeter ofthe more common geometric figures • Calculate the areaof the morecommon geometric figures • Calculate the volume of themore commongeometric figures • Solving equations • AnalyticGeometry (circle,parabola, line, ellipse, hyperbole...) •Trigonometry • Working withMatrices (Sum, Multiplication,Transposed, Determinant, Inverse) •Decomposition with Ruffini •Creation of Functions Graphs (only infull version) • CalculateDefinite Integrals (only in full version)• Calculate Derivativesof math funcions (only in full version) •Formulary (limits,derivatives and integrals) For a total of over 80functions,continues to rise. aMat, in addition to showing theresult of therequested operation, shows the procedure for obtainingthe result.Both the procedure in general and the procedure in theparticularcase (with the inserted data). Note: It is NOT a form(there aremany around) but aMat solve problems in your place!Reviews:☆http://www.tuttoandroid.net/applicazioni/app-of-the-day-amat-102755☆http://www.androidworld.it/2013/04/14/italia-chiama-android-amat-total-messager-super-guida-tv-150067☆http://android.hdblog.it/2013/04/19/amat-geometria-e-algebra-facile-sul-tuo-smartphone-o-tablet☆http://www.opengeek.it/app-android/utilita/amat-app-per-la-matematica

The critically acclaimed sequel to thepopularLearn Algebra app! Now you can learn the basic concepts ofAlgebra2 with the same intuitive interface andeffectivelesson-problem-quicknotes format of the first app all forFREE.This application is perfect for those who have:- Trouble paying attention in class- Improper instruction- General disinterest in mathDon’t worry! Come finals day, you’ll be prepared withourcomprehensive algebra app. Our app features everything you’llneedto learn algebra, from an all-inclusive algebra textbook toanumber of procedural problem generators to cementyourknowledge.Features:- Abridged algebra textbook, covering many aspects ofthesubject- Procedural problem generators, ensuring you will not encounterthesame problem twice- Problem explanations, demonstrating step-by-step how to doeachproblem- Quicknotes, reviewing entire chapters in minutes- Intuitive graphing interface, teaching propergraphingmethods- Statistics tracking, helping you identify your weaknessesPlus, new chapters are added all the time!Subjects covered:Ch. 1: Functions1.1 Introduction to Functions1.2 Operations with Functions1.3 Absolute Value Functions1.4 Piecewise Functions and ContinuityCh. 2: Polynomials2.0 Polynomials Review2.1 Introduction to Rational Functions2.2 Multiplying and Dividing Rational Functions2.3 Adding and Subtracting Rational Functions2.4 Solving Rational EquationsCh. 3: Linear Systems3.0 Linear Systems Review3.1 Systems of Three Equations3.2 Determinants and Cramer's Rule3.3 Systems of InequalitiesCh. 4: Exponentiation4.0 Exponential Functions Review4.1 Introduction to Logarithms4.2 Solving Exponential and Logarithmic Functions4.3 Models of Exponential GrowthCh. 5: Conics5.1 Parabolas5.2 Circles5.3 Ellipses5.4 Hyperbolas

BeMathly is an application to aid invariousmathematical calculations from different types ofstatisticaldistributions to the solution of a quadratic equation.Thisapplication can also be use to quickly check the answersofdifficult or time consuming questions that you may encounterwhilestudying or revising.Listed functions as follows:- function to calculate the angle between two vectors- binomial distribution calculator- binomial expansion calculator- bubble sort algorithm- cumulative binomial distribution calculator- cumulative poisson distribution calculator- matrix 2x2 determinant calculator- matrix 3x3 determinant calculator- equation of a circle calculator- equation of a line calculator- normal distribution calculator- poisson distribution calculator- solutions to a quadratic equation- solutions to a cubic equation- sum of an arithmetic sequence- sum of a geometric sequence- vector line equation calculator- large factorial function (using prime swing algorithm)- critical region solver- regression & correlation solver- symbolic differentiation- area for any regular polygonfor suggested functions or improvements you can contactmeat:[email protected]

The dkayMath app allows you to solve college level math problemsonyour android based phone. Choose from four different subjectareasincluding linear algebra, calculus, parametric equations,anddifferential equations. This utility will allow you to checkyourhomework or review problems by giving step by step outputleadingup to the solution. Simply hit the Rand button to see anexampleproblem worked out in its entirety. Features unrestrictedinputwhich allows for a wide array of problems that can be solved.Matrix operations: echelon form, reduced echelon form,inverse,inverse by adjoint, adjoint matrix, characteristicpolynomial,determinants up to 5x5, eigenvalues and eigenvectors,nullspace,spanning set, rowspace, range, left nullspace, wronskian,LUfactorization, Hessenberg form, Hessenberg polynomial,Householdertransform, QR factorization, and least squaressolutions.Single variable equation operations:differentiation,integration, multiply, and root finding.Parametric equation operations: gradient, is gradient of,curl,and divergence.Differential Equation operations: Solve second orderdifferentialequation, and solve second order initial valueproblems.Please feel free to email me if you have any suggestions fornewproblem types or are having problems with the program. I'llissueupdates as soon as I can with new content/fixes based onuserfeedback.Visit my website and use the browser version of dkayMathaswell!By downloading you agree to the terms ofuse:dkaymath.com/terms.phpNote: Permissions required are only used for serving ads.

Trial version with limited features.

10th grade is first class inhighschoolprograms, knowledge math of 10th grade is very importantinthealgebra and analytics. If students learned math well in10thgradethen there is a basis for later learning numeracy 11thgrade,and12th grade.Math Academy app covers basic skills and high school.Itcategorizesdifferent aspects of math in such a way that youcanpick up whatyou plan to learn and start learning. We plan tocoverall thetopics in math general education. You can enjoythefollowingtopics: Math curriculum, high school, helpingstudents,math, fromgrade 1 to grade 12, refresher, math problems,math,weekly,accounting revision, review, Algebra, mathcollege,calculus,college some, integral, differential, complexnumbers,matrix,function.Tenth grade math: Congruent triangles, Algebra,Points,lines,segmentsgeometry and moreAlgebra reviewPoints, lines, and segmentsAnglesParallel and perpendicular linesLines in the coordinate planeIntroduction to trianglesTwo-dimensional figuresThree-dimensional figuresLogicIntroduction to congruent figuresCongruent trianglesTransformationsTrianglesQuadrilateralsSymmetrySimilarityRight trianglesTrigonometryArea and perimeterSurface area and volumeCirclesCircles in the coordinate planeMeasurementProbabilityVectorsThis app has the following sections tutorials,formulas,calculation,theory questions, quiz, dictionary,scientificcalculator, graphingcalculator, math tricks, brainteaser, unitconverter, times, binaryconverter, statisticscalculator. This appcan be used for everybody, teachers andstudents planning to writeexam.If you have a suggestion or issue with this app please kindlyletusknow through email. We always try to respond immediatelyEmail: [email protected]: http://www.math1to12.com/enFacebook: https://www.facebook.com/hoctoanphothongPlease remember to rate this app.Thanks so much.