All Questions ⁺⁰237643 Questions

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help probability

Valeria has three coins, each of which has a probability of 1/2 of coming up heads. On her first turn, she flips all three coins. If all three come up heads, then she stops. Otherwise, for her second turn, she flips any coins that came up tails. read more ..

Guest Dec 20, 2022

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213

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Functions

The functions f and h are defined as follows:
f(x) = (x + 5)/(x - 7) and h(x) = (x + 5)(x - 7).

Explain why the functions f and h are not the same function. read more ..

Guest Dec 20, 2022

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169

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help geometry

Let AB be a diameter of a circle, and let C be a point on the circle such that AC=8 and BC=14 The angle bisector of ACB intersects the circle at point M Find CM.

Guest Dec 20, 2022

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187

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Math question 7th grade

a farmer sells an average of 15 3/5 bushels of corn each day what integer represents the change in bushels of corn in his inventory after 6 days

Guest Dec 20, 2022

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162

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Coordinates

A median of a triangle is a line segment joining a vertex of a triangle to the midpoint of the opposite side. The three medians of a triangle are drawn below.

Note that the three medians appear to intersect at the same point! Let's read more ..

Guest Dec 20, 2022

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178

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Function

The function f(n) satisfies
binom(2n)n - binom(2n + 1)(2n) = f(n) *binom(2n + 1)(n + 1)
for all positive integers n. Find f(n).

Guest Dec 20, 2022

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217

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+17

Geometry - please explain your answer without the use of cosines

In the diagram, ∠ABC = ∠BDC = 90◦. We know BD = 30 and CD = 72. What is AB?
read more ..

Chickenfingrrss Dec 20, 2022

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158

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counting problems

Let n be a positive integer. Let k be a positive integer.

(a) Using a counting argument, show that C(n - 1, k - 1) + C(n - 1, k) = C(n,k).
read more ..

Guest Dec 20, 2022

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213

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Counting problem

There is a group of five children, where two of the children are twins. In how many ways can I distribute 17 identical pieces of candy to the children, if the twins must get an equal amount of candy?

Guest Dec 20, 2022

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173

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help probability

A bag contains five white balls and three black balls. Your goal is to draw two white balls.

(a) You simultaneously draw two balls at random. What is the probability that they are both white?
(b) You simultaneously draw two balls read more ..

Guest Dec 20, 2022

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Given ∆FPM ~ ∆DGV with a scale factor of 8:5. If the perimeter of ∆FPM is 72, what is the perimeter of ∆DGV?

Given ∆FPM ~ ∆DGV with a scale factor of 8:5. If the perimeter of ∆FPM is 72, what is the perimeter of ∆DGV?

Guest Dec 20, 2022

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172

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Probability

In the SuperLottery, three balls are drawn (at random, without replacement) from white balls numbered from 1 to 12, and one SuperBall is drawn (at random) from red balls numbered from 13 to 20. When you buy a ticket, you choose three numbers from 1 to 12, read more ..

Guest Dec 20, 2022

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172

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binomials

Simplify binom{100}{50}/binom{200}{51}*binom{100}{51}/binom{200}{50}

Guest Dec 20, 2022

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176

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binomials

Fill in the blanks to make the equation true (Each blank should contain a positive integer.)

\binom{n}{k} = \binom{n - 2}{k} + \binom{n - 2}{k - 1} + \binom{n - 1}{k} + \binom{n - 1}{k - 1} + \binom{n}{k - 1} + \binom{n}{k + read more ..

Guest Dec 20, 2022

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173

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решите задачу

в коробке должно быть 7 белых и 5 черных шаров. Вынимаю на угад два шара. Найти вероятность того, что они 1) белые; 2) разные; 3) одного цвета

Guest Dec 20, 2022

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210

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Factoring

We are looking to factor 23x^2 + kx - 5 + x^2 - 3. Some values of k allow us to factor it as a product of linear binomials with integer coefficients. what are all such values of k?

Guest Dec 20, 2022

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210

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Algebra

Find all solutions of the equation
|x^2 - 30x - 1| + |x^2 - 30x + 29| = 30.

Guest Dec 20, 2022

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202

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counting

How many solutions are there to the equation
u + v + w + x + y + z = 18
where u, v, w, x, y, and z are nonnegative integers, and x is at most 10?

Guest Dec 20, 2022

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Norman wants to buy a soda costing 75 cents. He has an unlimited supply of dimes and nickels.

Norman wants to buy a soda costing 75 cents. He has an unlimited supply of dimes and nickels. How many times can he insert coins into the vending machine to pay for soda?

Guest Dec 20, 2022

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194

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% Equations

Answe this question: Rebecca sells dolls at her doll store. If she sells a doll for $19, and there is 6% sales tax, what is the total cost of the doll? Round your answer to the nearest cent.

Guest Dec 20, 2022

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176

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Graphing

The graph of y = f(x) is shown below.

For each point (a,b) that is on the graph of y = f(x), the point ((a - 7)/2, (3b + 1)/4) is plotted, forming the graph of another function y = g(x). As an example, the point read more ..

Guest Dec 20, 2022

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157

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Triangle

Let ABC be a triangle, and let its angle bisectors be AD, BE, and CF, which intersect at I. If DI = 3, BD = 4, and BI = 8, then find the area of triangle ABC.

Guest Dec 20, 2022

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231

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+19

7th Grade topics 1 & 2 Midterm (question 7-30)

expression is equivalent to (–60) ÷ 5?
Select all that apply.

A. read more ..

LIzzie6348 Dec 20, 2022

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161

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complex numbers

Find all the solutions to z^4 = -4 - 5z^2 in complex numbers.
Express all the solutions in the form a + bi, where a and b are real numbers.

Guest Dec 20, 2022

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