All Questions

637

can anyone help

ABCD is a square. Given PA = 1; PB=3 and PD=7, find the area of square ABCD.

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Guest Jun 23, 2020

424

probability

A small class of nine boys are to change their seating arrangement by drawing their new seat numbers from a box. After the seat change, what is the probability that there is only one pair of boys who have switched seats with each other and only three boys read more ..

Guest Jun 23, 2020

508

probability

A room has nine desks arranged in three rows of three desks. Three students sit in the room. If the students randomly choose a desk, find the probability that two out of the front three desks are chosen.

Guest Jun 23, 2020

581

help

One fourth of a number is equal to three times of nineteen. What is one sixth of that number

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Guest Jun 23, 2020

560

counting

In the opening ceremony of the 2014 FIFA World Cup Brazil, all football teams who participates gathered together. The team captain of each team was handshaking with one another to promote their new act for world peace which was called "A Handshake for Peace!". read more ..

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Guest Jun 23, 2020

818

What happened to CPhill?

On the Top Users page, I only see Melody, Alan, heureka, ..., but no CPhill. What happened to him?

off-topic

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GlennJamin5000 Jun 23, 2020

446

help

Compute

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Guest Jun 23, 2020

580

king arthur problems

(1)10 chairs are arranged evenly around King Arthur's round table. In how many ways can 10 knights be seated in the chairs, if Sir Lancelot and Sir Gawain insist on being seated diametrically opposite each other?

(2)
Now read more ..

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Guest Jun 23, 2020

603

help

Write the vertex of the function f(x) = -4x^2 - 12x + 9.

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Guest Jun 23, 2020

869

Need help with a proof.

Let $P(x)$ be a nonconstant polynomial, where all the coefficients are nonnegative integers. Prove that there exist infinitely many positive integers $n$ such that $P(n)$ is composite. I have been able to get three cases. When a0=0, when a0 is greater than read more ..

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Guest Jun 23, 2020

791

+781

Repost of: Factoring- I'm kind of stuck and don't know what to do.

(b) Compute the sum .

So I think I will have to apply difference of squares to this. But the many variables are confusing me and making it harder for me. I don't quite get the "2n+1, 2n, 2n-1 etc" part so it's making it difficult read more ..

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gwenspooner85 Jun 23, 2020

1567

+55

Another geo problem

Hi! I have another geometry problem that I'm stuck on, can someone give me a hint or push me in the right direction?

The vertices of triangle ABC lie on the sides of equilateral triangle DEF, as shown. If CD = 3, CE = BD read more ..

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ConfuzzledKitten Jun 23, 2020

539

help

Solve the equation 2x^2 - 10x + 35 = x^2 + 10.

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Guest Jun 23, 2020

547

help

Solve the inequality (x - 3)(x - 5)x < 0.

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Guest Jun 23, 2020

576

how can i do this?

If a, b are real number, two sets and What is b - a?

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Guest Jun 23, 2020

580

math

John is 3/4 the age of James. Three years ago, John was 5/2 the age of James. How old is James?

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Guest Jun 23, 2020

614

please help

Find the sum of the first 14 terms of this progression, 2, 5, 8, 11,.....?

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Guest Jun 23, 2020

616

+335

midpoint fun

What is the slope of the line containing the midpoint of the segment with endpoints at $(2, 4)$ and $(0, -2)$ and the midpoint of the segment with endpoints at $(5, 1)$ and $(1, 5)?$ Express your answer in simplest form.

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Rayjplayz Jun 23, 2020

439

help

Find primes p and q such that p^2 - 3q = 64.

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Guest Jun 23, 2020

1033

Some Help

A number is divisible by 9 if the sum of its digits is divisible by 9. For example, the number 19,836 is divisible by 9 but 19,825 is not.
If D767E89 is divisible by 9, where D and E each represent a read more ..

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Guest Jun 23, 2020

443

help

Person A works twice as fast as person B. Person B can complete a piece of work independently in 12 days. Find the number of days taken by person A and B together to finish the work.

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Guest Jun 23, 2020

760

HHEELLPP

Solve for the variable $x$ in terms of $y$ and $z$, assuming $y\neq 3$: \[xy = 3x + 2y + z.\]

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Guest Jun 23, 2020

634

help

The average of 10 numbers is 10. If a number is excluded from this set, then the new average becomes 9.
What is the value of the number that was excluded?

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Guest Jun 23, 2020

518

can anyone help?

There are 8 people sitting at a circular table, including Sam, Rebecca, and Diane. Find the number of ways of arranging the 8 people, so that Sam sits directly between Rebecca and Diane.

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Guest Jun 23, 2020

772

+781

Factoring- I'm kind of stuck and don't know what to do.

Compute the sum .

So I think I will have to apply difference of squares to this. But the many variables are confusing me and making it harder for me. I don't quite get the "2n+1, 2n, 2n-1 etc" part so it's making it difficult read more ..

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gwenspooner85 Jun 23, 2020

All Questions ⁺⁰237722 Questions

can anyone help

probability

probability

help

counting

What happened to CPhill?

help

king arthur problems

help

Need help with a proof.

Repost of: Factoring- I'm kind of stuck and don't know what to do.

Another geo problem

help

help

how can i do this?

math

please help

midpoint fun

help

Some Help

help

HHEELLPP

help

can anyone help?

Factoring- I'm kind of stuck and don't know what to do.

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