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453

expected value problem

Three players enter a room and a red or blue hat is placed on each person's head. The color of each hat is determined by a coin toss, with the outcome of one coin toss having no effect on the others. Each person can see the other players' hats but not his read more ..

Guest Feb 13, 2020

1088

help

The distribution of SAT scores is normal with a mean of µ = 500 and a standard deviation of σ = 100. a. What SAT score (i.e., X score) separates the top 15% of the distribution from the rest?b. What SAT score (i.e., X score) separates the top 10% of the read more ..

ElectricPavlov ●

Guest Feb 13, 2020

669

math

A kite forms a 25° angle with the ground. The wind picks it up so that it then forms a 74° angle with the ground

off-topic

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Guest Feb 13, 2020

698

help

A Can Complete a work in 12 days and B Can Complete in 8 days. A works for 8 hrs every day while works for 10 hours every day. If A and B together start wooking & his Perday, in how many days will they complete the work?

ElectricPavlov ●

Guest Feb 13, 2020

828

help

Jane is taking two courses. The probability she gets an A in the first course is 0.7. The probability she she gets an A in the second course is 0.8. The probability she gets an A in at least one of the courses is 0.9. What is the probability of passing read more ..

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Guest Feb 13, 2020

1558

+306

Let n be a positive integer. (a) Prove that by counting the number of ordered triples (a, b, c) where in two different ways. (b) Prove that

Let n be a positive integer.
(a) Prove that
by counting the number of ordered triples (a, b, c) where in two different ways.
(b) Prove that
by counting the number of subsets of containing three different numbers read more ..

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mathmathj28 Feb 13, 2020

748

+306

A stick is 5 inches long. It is broken at two points, chosen at random. What is the probability that all three pieces are longer than 1 inch

A stick is 5 inches long. It is broken at two points, chosen at random. What is the probability that all three pieces are longer than 1 inch?

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mathmathj28 Feb 13, 2020

2846

+306

Let triangle ABC be equilateral, where the side length is 3. A point D is chosen at random inside the triangle.

Let triangle ABC be equilateral, where the side length is 3. A point D is chosen at random inside the triangle. What is the probability that the length AD is at most 1?

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mathmathj28 Feb 13, 2020

1813

help

A utility pole is supported by two wires, one on each side, going in the opposite direction. The two wires form a 75-degree angle at the utility pole. if the wires are 12 meters and 16 meters long and secured to the ground, find the distance between the read more ..

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Guest Feb 13, 2020

906

+282

Scratch the Polynomial help. I figured it out!!!

I contacted my friend, (USJMO) competitor, he taught me using modulos and figured it out. Thank you guys for all your help :D

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DragonLord Feb 13, 2020

774

+1995

Hi! I need some help with these 2 questions. thank you in advance.

Hi! I need some help with these 2 questions. thank you in advance.

read more ..

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jjennylove Feb 13, 2020

1067

help please

A pot contains 6 L of brine at a concentration of 110 g/L. How much of the water should be boiled off to increase the concentration to 200 g/L?

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Guest Feb 13, 2020

1014

+1490

Amazing Math

Can someone explain this: sqrt( 50 ) = 10 * sine or cosine of 45°

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Dragan Feb 13, 2020

1158

DESPERATELY NEED HELP ASAP!

The grid lines in the graph below are one unit apart. The red parabola shown is the graph of the equation y=ax^2+bx+c. Find a+b+c. NOTE: the answer isn’t -3.

read more ..

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Guest Feb 13, 2020

587

help

A plane intersects a prism to form a cross section that is a polygon with five sides. What is the minimum number of sides that the polygon at the base of the prism must have?

Guest Feb 13, 2020

3912

+1005

There are $18$ chairs numbered from $1$ through $18$ around a circular table. How many ways can three people be seated, so that no two peopl

There are chairs numbered from 1 through 18 around a circular table. How many ways can three people be seated, so that no two people are adjacent?

Alright, the answer is 3276. Without any restrictions, there a total of read more ..

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hugomimihu Feb 13, 2020

999

help

Five cards are dealt from a standard 52-card deck.
(a) What is the probability that we draw 1 ace, 1 two, 1 three, 1 four, and 1 five (this is one way to get a "straight")?
(b) What is the probability that we draw any straight (including read more ..

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Guest Feb 13, 2020

1071

help

One leg of a right triangle measures 3 cm. The hypotenuse of the right triangle measures 3 cm less then twice the length of the unknown leg. Find the measure of all of the sides of the triangle.

CalculatorUser ●●●●●

Guest Feb 13, 2020

736

Size of a field

Following the bounary of a rectangular field, it requires 11 rounds of a lawn mower to cut 1/2 of it and 14 more to cut the remainder. If the lawn mower cuts a swath 2 feet wide and all swaths are full, what are the dimensions of the field. Thank you for read more ..

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Guest Feb 13, 2020

768

help please

Compute the unique positive integer $n$ such that

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Guest Feb 13, 2020

464

help

Determine

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Guest Feb 13, 2020

2120

+296

I think someone should fully answer 'DragonLords' questions.

Let be a nonconstant polynomial, where all the coefficients are nonnegative integers. Prove that there exist infinitely many positive integers such that is composite.

I can prove it for all cases that read more ..

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EpicWater Feb 13, 2020

542

Algebra problem----Please help

Let f(x) = 2x + 7 and g(x) = 3x + c. Find c if for all x.

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Guest Feb 13, 2020

All Questions ⁺⁰237665 Questions

expected value problem

help

math

help

help

Let n be a positive integer. (a) Prove that by counting the number of ordered triples (a, b, c) where in two different ways. (b) Prove that

A stick is 5 inches long. It is broken at two points, chosen at random. What is the probability that all three pieces are longer than 1 inch

Let triangle ABC be equilateral, where the side length is 3. A point D is chosen at random inside the triangle.

help

Scratch the Polynomial help. I figured it out!!!

Hi! I need some help with these 2 questions. thank you in advance.

help please

Amazing Math

DESPERATELY NEED HELP ASAP!

help

There are $18$ chairs numbered from $1$ through $18$ around a circular table. How many ways can three people be seated, so that no two peopl

help

help

Size of a field

help please

help

I think someone should fully answer 'DragonLords' questions.

Algebra problem----Please help

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