All Questions ⁺⁰237784 Questions

+1

151

2

counting

Plz help
A standard six-sided die is rolled 7 times. You are told that among the rolls, there was one 1, two 2's, and three 4's. How many possible sequences of rolls could there have been? (For example, 5, 1, 2, 2, read more ..

Guest Apr 8, 2023

+2

141

8

+81

I need some halp again...

Consider the sum , where the last addend has 20 digits. Find the digit in the hundreds place of the resulting sum. Give a convincing argument with your answer.

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moneydude242 Apr 8, 2023

+1

149

0

geometry

Points X, Y, and Z are on the sides QR , PR, and PQ respectively, of right triangle PQR such that PZXY is a square. If PQ=10 and PR=10, then what is the side length of the square?

Guest Apr 8, 2023

+1

140

4

+81

I got a question - the FLEA question

Each of n cats has 2n fleas. If two cats (and their fleas) are removed, and three fleas are removed from each remaining cat, the total number of fleas remaining would be half the original total number of fleas. What is the value of n?

moneydude242 Apr 8, 2023

+1

159

1

Counting

In how many ways can three pairs of siblings from different families be seated in two rows of three chairs, if siblings may sit next to each other in the same row, but no child may sit directly in front of their sibling?

Guest Apr 8, 2023

Apr 7, 2023

0

109

1

Algebra

Given a positive integer n, the rational number r satisfies
2n/n - 2n/(n + 1) = r*2n/n.
Express r in terms of n. (Your expression should be as simplified as possible.)

Guest Apr 7, 2023

0

143

0

geometry

Let B, A, and D be three consecutive vertices of a regular -gon. A regular heptagon is constructed on AB with a vertex C next to A Find angle BCD in degrees.

Guest Apr 7, 2023

0

164

1

Counting

When two standard 6-sided dice are rolled, there are 36 possible outcomes for the sum of the two rolls: one sum of 2, two sums of 3, and so on, up to one sum of 12.
Find all possible ways of numbering two 6-sided dice read more ..

Guest Apr 7, 2023

0

167

2

Probability

What do I do
Right triangle XYZ has legs of length XY = 12 and YZ = 6. Point D is chosen at random within the triangle XYZ. What is the probability that the area of triangle XYD is at most 20?

Guest Apr 7, 2023

0

148

2

which algebraic expression is equivalent to this expression

Guest Apr 7, 2023

0

159

1

Algebra

For a certain value of k, the system
x + y + 3z = 10
-4x + 8y + 5z = 7
kx + z = 3 read more ..

Guest Apr 7, 2023

0

146

0

precalc

Plz help with parametric equations
The position of a particle is given by the parametric equations
x = 1 + sin pi*t - cos pi*t
y = 3*sin pi*t + 2*cos pi*t read more ..

Guest Apr 7, 2023

0

156

1

Probability

When it rains, every student in Margo's school brings a raincoat, an umbrella, or both. And of the students bring both. The total number of umbrellas brought is equal to twice the number of raincoats.
What percent of the read more ..

Guest Apr 7, 2023

0

157

1

Probability

Need help with probability
My sock drawer contains two red socks, two white socks, and two blue socks. For three days in a row, I pull out two socks out of my sock drawer at random. What is the probability that I get matching read more ..

Guest Apr 7, 2023

0

166

1

geometry

Help with parallelogram
In the diagram below, PQRS is a parallelogram with a perimeter of 26 and an area of 28. What is the perimeter of rectangle OSTQ? Include an explanation of how you solved the problem.

Guest Apr 7, 2023

0

166

1

+180

f(x)=(x²-1)/(x²+3x+2) & Asymptotes

Consider the function f(x)=(x²-1)/(x²+3x+2)
a) Identify any asymptotes and/or holes. If there are any vertical asymptotes, state the behaviour of the graph on both sides.
b) State the domain and range.
c) Graph f(x). read more ..

DumbDude05 Apr 7, 2023

0

152

1

+180

Find constants a and b such that the graph of f(x)=x³+ax²+bx will have a local max at (-2,9) and a local min at (1, 7).

Find constants a and b such that the graph of f(x)=x³+ax²+bx will have a local max at (-2,9) and a local min at (1, 7).

DumbDude05 Apr 7, 2023

0

169

1

counting

Sam writes down the numbers 1, 2, 3, ..., 99
(a) How many digits did Sam write, in total?
(b) Sam chooses one of the digits written down, at random. What is the probability that Sam chooses a 0?
(c) What is the sum of all read more ..

Guest Apr 7, 2023

0

169

1

Stats

A list of ten distinct, positive integers has a median of 5.5. What is the smallest possible average of the ten positive integers? Explain your ansswer in complete sentences.

Guest Apr 7, 2023

0

151

4

HELP

When simplified, what is the value of $\sqrt{3} \times 3^{\frac{1}{2}} + 12 \div 3 \times 2 - 4^{\frac{3}{2}}$?

Guest Apr 7, 2023

0

168

1

(pi)3^2x4.75

Guest Apr 7, 2023

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