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All Questions
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155968 Questions
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29
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help
A bag contains five white balls and five black balls. Your goal is to draw two black balls.
You draw two balls at random. Once you have drawn two balls, you put back any white balls, and redraw so that you again have two drawn balls. What is the probability
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Guest
Dec 3, 2019
+1
29
1
help
Solve 2^{2x} - 8 * 2^x + 12 = 0.
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Guest
Dec 3, 2019
Dec 2, 2019
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25
1
help
How many of the following statements is/are true?
(1): An odd number is never divisible by an even number.
(2): An odd number is never divisible by another odd number.
(3): An even number is never divisible by an odd number.
(4):
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Guest
Dec 2, 2019
0
19
1
help
The largest positive integer that divides the numbers 16 and 20 is 4.
What is the smallest value of the positive integer nn such that the largest positive integer that divides the numbers n,16, and 20 is also 4?
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Guest
Dec 2, 2019
+1
27
1
+156
In the complex plane, the graph of intersects the graph of in exactly one point. Find all possible values of .
In the complex plane, the graph of intersects the graph of in exactly one point. Find all possible values of .
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AoPS.Morrisville
Dec 2, 2019
0
1
40
1
Help Pls
Let $z$ be a complex number such that z^2 + |z|^2 = 3 - 5i.Find |z|^2.
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Guest
Dec 2, 2019
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31
1
help
Solve the equation sqrt(x + 4) = x - 2.
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Guest
Dec 2, 2019
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25
2
help
It takes 4 cooks 4 hours to bake 4 cakes. Assuming no change of rate, how many hours will it take 8 cooks to bake 8 cakes?
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Guest
Dec 2, 2019
0
32
3
help
Find the smallest positive multiple of 7 that leaves a remainder of 4 when divided by 6, 9, 15, and 18.
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Guest
Dec 2, 2019
0
20
1
help
Find all integers n such that n^2 + 1 is divisible by n + 1.
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Guest
Dec 2, 2019
0
43
7
+21
MATH. PLEASE HELP ME
All A are B. One-third of all D are A. Half of all C are B. One C is a A. Eight C are D. There are 90 B. Draw the Venn diagram. How many B are neither A nor C?
Correct question is on a post further down. Melody.
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marydien
Dec 2, 2019
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26
1
help
Find the smallest positive integer which ends in 17, is divisible by 17, and whose digits sum to 17.
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Guest
Dec 2, 2019
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22
1
help
How many ways can 2020 be expressed as the sum of consecutive integers?
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Guest
Dec 2, 2019
0
21
1
help
Find the smallest positive integer n such that 224*n is a perfect square.
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Guest
Dec 2, 2019
0
26
1
help please
How many pairs of perfect squares between 1 and 100 inclusive differ by a prime number?
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Guest
Dec 2, 2019
0
31
1
help
Let f(x) = (x + 1)/(x - 1). What is f(f(2010))?
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Guest
Dec 2, 2019
0
22
1
help
If f is a function such that f(f(x)) = x^2 - 1, then what is f(f(f(f(3))))?
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Guest
Dec 2, 2019
0
27
1
help
William travels to school in two different ways. Either he walks to school and takes the bus home, or he takes the bus to school and walks home. In each case his total travelling time is 40 minutes. If he were to take the bus both ways, his total travelling
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Guest
Dec 2, 2019
0
22
1
help
m and n are the roots of x^2 + mx + n = 0. Find m and n.
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Guest
Dec 2, 2019
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21
1
help
Let P be the product of three consecutive positive odd integers. Find the largest integer that aways divides P.
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Guest
Dec 2, 2019
+1
28
1
help
If 1/x < 2 and 1/x > -3, then find all possible values of x.
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Guest
Dec 2, 2019
0
27
2
help
What is the value of b in the equation y = 3x + b, given that the line passes through the point (17,21)?
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Guest
Dec 2, 2019
0
31
1
help
Points Q and R are on segment PS, which has length 24. If PQ is half as long as QS, and QR is 3 times as long as RS, how long is RS?
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Guest
Dec 2, 2019
0
29
1
help
If the points (k, k + 2), (0, k - 6), (k - 4, k) all lie on the same line, find k.
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Guest
Dec 2, 2019
0
30
1
help
Find the area of the triangle whose vertices are O(0,0), A(6,3) and B(1, -7).
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Guest
Dec 2, 2019
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