Precalculus Mathematics Homework Help Forum

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Free pre-calculus mathematics homework help from qualified mentors. Math courses prior to calculus homework. Please use the template when requesting help and show your work.
How do I manually stack photos for an equal average using given opacity levels?
  • LightningInAJar
  • · Replies 46 ·
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Verify that ## 17 ## divides ## 11^{104}+1 ##
  • Math100
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Can we use criss-cross approach with complex number equations?
  • vcsharp2003
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9
Understanding cot2(theta) = A-C / B
  • Terrell
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8
Obtain the two incongruent solutions modulo 210 of the system
  • Math100
  • · Replies 7 ·
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7
Find the solutions of ## 7x+3y\equiv 6\pmod {11} ##.
  • Math100
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Can this system of inequalities be solved for x?
  • annamal
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Find the solutions of the following system of congruences
  • Math100
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Obtain the eight incongruent solutions of the linear congruence
  • Math100
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Find the solutions of the system of congruences
  • Math100
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How to find all solutions of ## 3x-7y\equiv 11\pmod {13} ##?
  • Math100
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Is 2i + j + 3k the Normal Vector of Plane CDPQ?
  • songoku
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5
Find an integer having the remainders ## 2, 3, 4, 5 ##.
  • Math100
  • · Replies 2 ·
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Finding Integer with Chinese Remainder Theorem
  • Math100
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Prove that ## x\equiv 1\pmod {2n} ##
  • Math100
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Prove that the congruences admit a simultaneous solution
  • Math100
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Is this question doable? Finding triangle side length
  • shirozack
  • · Replies 27 ·
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What was the least number of coins that could have been stolen?
  • Math100
  • · Replies 3 ·
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3
Using 5C2 to calculate number of ways to get 2 heads in 5 coin tosses
  • Darkmisc
  • · Replies 4 ·
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4
Calculating Modulo for -3 and 26: Understanding the Remainder Calculation
  • shivajikobardan
  • · Replies 22 ·
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Find the smallest number of eggs
  • Math100
  • · Replies 1 ·
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Expected Value of Election Results
  • vparam
  • · Replies 7 ·
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7
How to obtain three consecutive integers?
  • Math100
  • · Replies 3 ·
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3
Solve ##x\equiv 5\pmod{11},x\equiv 14\pmod{29},x\equiv 15\pmod{31}##
  • Math100
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Solve ##x\equiv 1\pmod {3},x\equiv 2\pmod {5},x\equiv 3\pmod 7 ##
  • Math100
  • · Replies 1 ·
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Solve the following linear system
  • chwala
  • · Replies 21 ·
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Solve ## 6x\equiv 15\pmod {21} ##.
  • Math100
  • · Replies 7 ·
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Solve ## 25x\equiv 15\pmod {29} ##.
  • Math100
  • · Replies 1 ·
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Show that ## 11\mid R_{n} ## if and only if ## n ## is even
  • Math100
  • · Replies 3 ·
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Determine whether each of the ISBNs below is correct
  • Math100
  • · Replies 7 ·
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Determine the value of the obscured digit
  • Math100
  • · Replies 1 ·
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Obtain the check digits in this problem
  • Math100
  • · Replies 1 ·
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Why Do Some Projects Fail Despite Best Efforts?
  • kal-kim
  • · Replies 4 ·
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4
Find the missing digits in this problem about an invoice
  • Math100
  • · Replies 1 ·
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Prove that ## 13 ## divides ## 10^{2p}-10^{p}+1 ##
  • Math100
  • · Replies 1 ·
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1
Finding a solution to the Diophantine equation 6x + 10y + 45z =1
  • MidgetDwarf
  • · Replies 2 ·
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Show that ## 9\mid R_{n} ## if and only if ## 9\mid n ##
  • Math100
  • · Replies 2 ·
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Factor the repunit ## R_{6}=111111 ## into a product of primes
  • Math100
  • · Replies 3 ·
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Proof: Palindromes Divisible by 11
  • Math100
  • · Replies 1 ·
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Prove that ## 7, 11 ##, and ## 13 ## all divide ## N ##
  • Math100
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Verify that ## N-M ## is divisible by ## 9 ##
  • Math100
  • · Replies 7 ·
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Determine whether the integer ## 1010908899 ## is divisible by....
  • Math100
  • · Replies 6 ·
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Proof That 6 Divides Any Integer N
  • Math100
  • · Replies 3 ·
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Solve the given simultaneous equation
  • chwala
  • · Replies 32 ·
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Minimum Length of Cuts for Unfolding Box Into Flat Sheet?
  • Darkmisc
  • · Replies 10 ·
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If ##x> 1## and ##x^2 <2##, prove ##x < y##, ##y^2<2##
  • issacnewton
  • · Replies 10 ·
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Linearity and non-linearity in addition and multiplication
  • Thytanium
  • · Replies 15 ·
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15
Supply Equation: Y=mx+c or S=d*Qty+c, Why P Instead of Qty?
  • shivajikobardan
  • · Replies 7 ·
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7
Can this be solved without trial and error?
  • Darkmisc
  • · Replies 6 ·
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6
Huge Multi Part Prob + Stats question from past paper
  • hb2325
  • · Replies 1 ·
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Show that ## 2^{n} ## divides an integer ## N ##.
  • Math100
  • · Replies 6 ·
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6
Which formula do I use? (Megastats Excel Statistics homework problem)
  • mexicnfmle
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Find the values of ## n\geq 1 ## for which ## 1+2+3+\dotsb +n ##.
  • Math100
  • · Replies 4 ·
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Solving for ##x## for a given inequality
  • brotherbobby
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Prove that there exists a prime with at least ## n ## of its digits.
  • Math100
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Show that ## t_{n+2k}\equiv t_{n}\pmod {k} ##.
  • Math100
  • · Replies 7 ·
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Determine the last three digits of the number ## 7^{999} ##
  • Math100
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No integer whose digits add up to ## 15 ## can be a square or a cube
  • Math100
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Obtain the digits ## x ## and ## y ##
  • Math100
  • · Replies 3 ·
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Solve for ##x## involving modulus
  • brotherbobby
  • · Replies 10 ·
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Triangle Math Help: Calculate Angles & Lengths with 46 & 35 Measurements
  • LightningInAJar
  • · Replies 11 ·
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11
Find the remainder when ## 4444^{4444} ## is divided by ## 9 ##.
  • Math100
  • · Replies 3 ·
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Show that ## a^{2}-a+7 ## ends in one of the digits ## 3, 7 ,9##
  • Math100
  • · Replies 6 ·
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Divisibility of Integers ## 176521221 ## & ## 149235678 ## by 9 & 11
  • Math100
  • · Replies 9 ·
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Proof: Divisibility of Integers by 4
  • Math100
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Proof: Integer Divisibility by 3 via Polynomials
  • Math100
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Proof That an Integer is Divisible by 2
  • Math100
  • · Replies 3 ·
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Finding constant related to random variable
  • songoku
  • · Replies 8 ·
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8
Sailing along multiple Bearings Problem
  • SiriusA
  • · Replies 9 ·
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If f(x)=(e^x+e^-x)/2, what is the inverse function?
  • Darkmisc
  • · Replies 16 ·
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Clarification on Proof by Contradiction
  • Jonathanlikesmath
  • · Replies 32 ·
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Probability of getting the smallest value of cards
  • songoku
  • · Replies 9 ·
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9
Solve the problem that involves a sector of a circle
  • chwala
  • · Replies 14 ·
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14
Find the translation and stretch from ##y=2^x## to ##y=2^{x+4}##
  • chwala
  • · Replies 4 ·
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Possible values an expression can take : ##\dfrac{x^2-x-6}{x-3}##
  • brotherbobby
  • · Replies 7 ·
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Show the proof involving multiples of numbers
  • chwala
  • · Replies 19 ·
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19
Find the missing digits in the calculation below
  • Math100
  • · Replies 13 ·
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13
Application of N choose K, unsure of what is happening
  • Jonathanlikesmath
  • · Replies 6 ·
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6
Find the missing digits in the calculations below
  • Math100
  • · Replies 2 ·
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Is the integer ## (447836)_{9} ## divisible by ## 3 ## and ## 8 ##?
  • Math100
  • · Replies 12 ·
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Expected value of median of rolling three fair dice
  • Master1022
  • · Replies 9 ·
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9
Find the last two digits of the number ## 9^{9^{9}} ##.
  • Math100
  • · Replies 9 ·
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The units digit of a triangular number iw ## 0, 1, 3, 5, 6 ##?
  • Math100
  • · Replies 1 ·
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Any one of the integers ## 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ## can occur?
  • Math100
  • · Replies 3 ·
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3
For any integer ## a ##, the units digit of ## a^{2} ## is?
  • Math100
  • · Replies 7 ·
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Simplifying the Argument of a Complex Number
  • songoku
  • · Replies 19 ·
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19
Use the binary exponentiation algorithm to compute....
  • Math100
  • · Replies 1 ·
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All the possible posts in PF, all the possible human thoughts
  • Delta2
  • · Replies 23 ·
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23
Proving that an Integer lies between x and y using Set Theory
  • Hall
  • · Replies 15 ·
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15
Prove that ## b\equiv c\pmod {n} ##, where the integer is....
  • Math100
  • · Replies 1 ·
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Prove that whenever ## ab\equiv cd\pmod {n} ## and....
  • Math100
  • · Replies 3 ·
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Prove that ## 89\mid (2^{44}-1) ## and ## 97\mid (2^{48}-1) ##
  • Math100
  • · Replies 5 ·
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Prove that ## a^{({2}^{n})}\equiv 1\pmod {2^{n+2}} ## for any ##n##?
  • Math100
  • · Replies 6 ·
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Give an example to show that ## a^{k}\equiv b^{k}\pmod {n} ## ....
  • Math100
  • · Replies 3 ·
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Prove that the integers ## c, c+a, c+2a, c+3a, ...., c+(n-1)a ## ....
  • Math100
  • · Replies 6 ·
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Why is b^2 = 4 for this ellipse?
  • Darkmisc
  • · Replies 6 ·
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How many cards can be taken at most while satisfying a certain rule?
  • songoku
  • · Replies 4 ·
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Prove that ## aa_{1}, aa_{2}, ...., aa_{n} ## is also a complete set?
  • Math100
  • · Replies 14 ·
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Show that ## {2n \choose n}\equiv 0\pmod {p} ##?
  • Math100
  • · Replies 5 ·
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Prove: If the integer ## a ## is not divisible by ## 2 ## or ## 3 ##....
  • Math100
  • · Replies 9 ·
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