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.
Is 2i + j + 3k the Normal Vector of Plane CDPQ?
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5
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909
Find an integer having the remainders ## 2, 3, 4, 5 ##.
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2
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805
Finding Integer with Chinese Remainder Theorem
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3
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853
Prove that ## x\equiv 1\pmod {2n} ##
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2
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763
Prove that the congruences admit a simultaneous solution
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5
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932
Is this question doable? Finding triangle side length
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27
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1K
What was the least number of coins that could have been stolen?
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3
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2K
Using 5C2 to calculate number of ways to get 2 heads in 5 coin tosses
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4
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1K
Calculating Modulo for -3 and 26: Understanding the Remainder Calculation
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22
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2K
Find the smallest number of eggs
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1
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1K
Expected Value of Election Results
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7
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805
How to obtain three consecutive integers?
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3
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801
Solve ##x\equiv 5\pmod{11},x\equiv 14\pmod{29},x\equiv 15\pmod{31}##
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3
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2K
Solve ##x\equiv 1\pmod {3},x\equiv 2\pmod {5},x\equiv 3\pmod 7 ##
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1
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894
Solve the following linear system
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21
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Solve ## 6x\equiv 15\pmod {21} ##.
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7
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990
Solve ## 25x\equiv 15\pmod {29} ##.
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1
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824
Show that ## 11\mid R_{n} ## if and only if ## n ## is even
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3
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676
Determine whether each of the ISBNs below is correct
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7
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1K
Determine the value of the obscured digit
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1
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739
Obtain the check digits in this problem
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1
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706
Why Do Some Projects Fail Despite Best Efforts?
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4
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595
Find the missing digits in this problem about an invoice
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1
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995
Prove that ## 13 ## divides ## 10^{2p}-10^{p}+1 ##
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1
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772
Finding a solution to the Diophantine equation 6x + 10y + 45z =1
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2
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679
Show that ## 9\mid R_{n} ## if and only if ## 9\mid n ##
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2
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611
Factor the repunit ## R_{6}=111111 ## into a product of primes
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3
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804
Proof: Palindromes Divisible by 11
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1
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817
Prove that ## 7, 11 ##, and ## 13 ## all divide ## N ##
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6
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1K
Verify that ## N-M ## is divisible by ## 9 ##
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7
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Determine whether the integer ## 1010908899 ## is divisible by....
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6
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827
Proof That 6 Divides Any Integer N
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3
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1K
Solve the given simultaneous equation
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32
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2K
Minimum Length of Cuts for Unfolding Box Into Flat Sheet?
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10
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1K
If ##x> 1## and ##x^2 <2##, prove ##x < y##, ##y^2<2##
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10
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1K
Linearity and non-linearity in addition and multiplication
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15
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2K
Supply Equation: Y=mx+c or S=d*Qty+c, Why P Instead of Qty?
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7
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1K
Can this be solved without trial and error?
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6
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795
Huge Multi Part Prob + Stats question from past paper
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1
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2K
Show that ## 2^{n} ## divides an integer ## N ##.
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6
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1K
Which formula do I use? (Megastats Excel Statistics homework problem)
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8
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9K
Find the values of ## n\geq 1 ## for which ## 1+2+3+\dotsb +n ##.
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4
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798
Solving for ##x## for a given inequality
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3
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783
Prove that there exists a prime with at least ## n ## of its digits.
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2
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906
Show that ## t_{n+2k}\equiv t_{n}\pmod {k} ##.
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7
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796
Determine the last three digits of the number ## 7^{999} ##
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3
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2K
No integer whose digits add up to ## 15 ## can be a square or a cube
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4
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3K
Obtain the digits ## x ## and ## y ##
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3
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773
Solve for ##x## involving modulus
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10
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883
Triangle Math Help: Calculate Angles & Lengths with 46 & 35 Measurements
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11
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873
Find the remainder when ## 4444^{4444} ## is divided by ## 9 ##.
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3
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1K
Show that ## a^{2}-a+7 ## ends in one of the digits ## 3, 7 ,9##
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6
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1K
Divisibility of Integers ## 176521221 ## & ## 149235678 ## by 9 & 11
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9
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Proof: Divisibility of Integers by 4
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5
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1K
Proof: Integer Divisibility by 3 via Polynomials
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2
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931
Proof That an Integer is Divisible by 2
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3
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1K
Finding constant related to random variable
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8
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792
Sailing along multiple Bearings Problem
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9
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6K
If f(x)=(e^x+e^-x)/2, what is the inverse function?
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16
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1K
Clarification on Proof by Contradiction
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32
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1K
Probability of getting the smallest value of cards
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9
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982
Solve the problem that involves a sector of a circle
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14
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943
Find the translation and stretch from ##y=2^x## to ##y=2^{x+4}##
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4
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758
Possible values an expression can take : ##\dfrac{x^2-x-6}{x-3}##
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7
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760
Show the proof involving multiples of numbers
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19
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1K
Find the missing digits in the calculation below
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13
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880
Application of N choose K, unsure of what is happening
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6
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831
Find the missing digits in the calculations below
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2
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Is the integer ## (447836)_{9} ## divisible by ## 3 ## and ## 8 ##?
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12
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Expected value of median of rolling three fair dice
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9
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Find the last two digits of the number ## 9^{9^{9}} ##.
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9
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1K
The units digit of a triangular number iw ## 0, 1, 3, 5, 6 ##?
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1
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959
Any one of the integers ## 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ## can occur?
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3
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886
For any integer ## a ##, the units digit of ## a^{2} ## is?
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7
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1K
Simplifying the Argument of a Complex Number
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19
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1K
Use the binary exponentiation algorithm to compute....
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1
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745
All the possible posts in PF, all the possible human thoughts
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23
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835
Proving that an Integer lies between x and y using Set Theory
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15
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814
Prove that ## b\equiv c\pmod {n} ##, where the integer is....
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1
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761
Prove that whenever ## ab\equiv cd\pmod {n} ## and....
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3
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806
Prove that ## 89\mid (2^{44}-1) ## and ## 97\mid (2^{48}-1) ##
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5
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Prove that ## a^{({2}^{n})}\equiv 1\pmod {2^{n+2}} ## for any ##n##?
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6
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Give an example to show that ## a^{k}\equiv b^{k}\pmod {n} ## ....
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3
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811
Prove that the integers ## c, c+a, c+2a, c+3a, ...., c+(n-1)a ## ....
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6
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884
Why is b^2 = 4 for this ellipse?
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6
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848
How many cards can be taken at most while satisfying a certain rule?
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4
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797
Prove that ## aa_{1}, aa_{2}, ...., aa_{n} ## is also a complete set?
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14
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Show that ## {2n \choose n}\equiv 0\pmod {p} ##?
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5
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2K
Prove: If the integer ## a ## is not divisible by ## 2 ## or ## 3 ##....
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9
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1K
Finding area of a non right angled triangle
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9
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Surface area of a sphere ##= \pi * (a^2+b^2+c^2+d^2)##
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18
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Prove that ## a^{4}\equiv 0 ## or ## 1\pmod {5} ##?
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2
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842
Prove that ## a^{3}\equiv 0, 1 ##, or ## 6\pmod {7} ##?
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1
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777
Given an integer, find the probability its cube ends in 111
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19
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1K
How do you know how many solutions there are for z?
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2
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774
If ## a ## is an odd integer, then ## a^{2}\equiv 1\pmod {8} ##?
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2
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813
Show that ## (-13)^{n+1}\equiv (-13)^{n}+(-13)^{n-1}\pmod {181} ##?
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1
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1K
For ## n\geq 1 ##, use congruence theory to establish....
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3
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764
Question about limits involving 1/x
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10
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1K
For ## n\geq 1 ##, use congruence theory to establish....
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1
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695

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