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591

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There are 40 people in a room. All the people shake each other's hand once. (So if person 1 shook person 2's hand, person 2 shaking person 1's hand would not be a handshake.) How many handshakes occurred in all?

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Guest May 24, 2020

620

+224

Can someone answer this question? It has no explanation in the answer

https://web2.0calc.com/questions/please-explain-this-geometry-question

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envoy May 24, 2020

546

help

In triangle ABC, a = 11, b = 14, c = 21. Find cos A.

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Guest May 24, 2020

538

help

Find the sum 101 + 102 + 103 + ... + 200.

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Guest May 24, 2020

540

Convert r= 5/3sinθ−cosθ to rectangular form.

Convert r= 5/3sinθ−cosθ to rectangular form.
Enter your answer in slope-intercept form. Enter values so that fractions are simplified

Guest May 24, 2020

517

p and q are complex numbers such that |p|=7√3 and |p+q|=12√2.

p and q are complex numbers such that |p|=7√3 and |p+q|=12√2.
On what interval must |q| fall on?
[12√2−7√3,∞)
[12√2+7√3,∞) read more ..

Guest May 24, 2020

558

Convert the rectangular coordinates (4√3,−4) to polar form. Let r>0 and 0≤θ<2π.

Convert the rectangular coordinates (4√3,−4) to polar form. Let r>0 and 0≤θ<2π.
Enter coordinates as simplifed fractions or radicals in simplest form.

Guest May 24, 2020

504

help pls asap

If the point $(3,6)$ is on the graph of $y=g(x)$, and $h(x)=(g(x))^2$ for all $x$, then there is one point that must be on the graph of $y=h(x)$. What is the sum of the coordinates of that point?

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Guest May 24, 2020

470

help

See image.

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Guest May 24, 2020

473

help!

How many times does the number "7" show in the list of numbers from 1 to 1000?

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Guest May 24, 2020

435

can anyone help?

How many triangles are in this diagram?

Guest May 24, 2020

491

help

Find the number of 8-digit numbers the sum whose digits is 4.

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Guest May 24, 2020

738

+738

pLeasE pLeAse PLEASE hElP!!!!!

Find the number of paths from P to Q, where each step is to the right or up.

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lokiisnotdead May 24, 2020

564

help

Simplify

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Guest May 24, 2020

May 23, 2020

610

geometry

Point C divdies the semicircular arc AB of radius 10 in such a way that the product of chords AC and BC is 100. Find the central angles of the chords.

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Guest May 23, 2020

472

help

Two of the numbers {1, 2, 3, ..., 100} are chosen at random. What is the probability that their sum is odd?

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Guest May 23, 2020

653

Please Help!

Find the six-digit number N such that when its digits are reversed, the result is equal to 4N.

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Guest May 23, 2020

583

polynomial

The polynomial x^4 + 2x^3 - x + 1/4 can be written as the square of a polynomial p(x). Find p(x).

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Guest May 23, 2020

428

Help with Number Theory!

Find all positive integers n, such that n/11 = the sum of the digits of n.

(One example of a number that works is 198, because the sum of the digits in 198 = 1+9+8 = 18, and 198/11 = 18.)

Guest May 23, 2020

639

help

A fair coin is tossed five times. What is the probability that heads appears at least once?

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Guest May 23, 2020

679

+70

Help would be greatly appreciated :)

Let a ,b,c and d be real numbers such that a > b and c > d Enter the letters of the statements below that must be true:
(A) a + c > b + d
(B) 2a + 3c > 2b + 3d
(C) a - c > b - read more ..

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thesoccerfish May 23, 2020

666

+20

I don't know how to do this...

A club with five men and six women wish to form a committee. The number of men must be between 1 and 3 (inclusive), and the number of women must be between 2 and 4 (inclusive). How many different committees can be formed?

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JaritoDaFrito May 23, 2020

423

please help

A collection of nickels, dimes and pennies has an average value of 7¢ per coin. If a nickel were replaced by five pennies, the average would drop to 6¢ per coin. What is the number of dimes in the collection?

Guest May 23, 2020

542

help

If two distinct members of the set {2, 4, 10, 12, 15, 20, 50} are randomly selected and multiplied, what is the probability that the product is a multiple of 100?

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Guest May 23, 2020

All Questions ⁺⁰237665 Questions

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Can someone answer this question? It has no explanation in the answer

help

help

Convert r= 5/3sinθ−cosθ to rectangular form.

p and q are complex numbers such that |p|=7√3 and |p+q|=12√2.

Convert the rectangular coordinates (4√3,−4) to polar form. Let r>0 and 0≤θ<2π.

help pls asap

help

help!

can anyone help?

help

pLeasE pLeAse PLEASE hElP!!!!!

help

geometry

help

Please Help!

polynomial

Help with Number Theory!

help

Help would be greatly appreciated :)

I don't know how to do this...

please help

help

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