All Questions ⁺⁰237665 Questions

+5

687

4

+1072

Help Please!!!

Let \[S = \frac{1}{2^3} + \frac{1}{4^3} + \frac{1}{6^3} + \dotsb\]and \[T = \frac{1}{1^3} + \frac{1}{3^3} + \frac{1}{5^3} + \dotsb.\]Find $S/T$.

SpongeBobRules24 Feb 15, 2020

+6

728

3

+1072

Help Please!!!

It is possible to place positive integers into the vacant twenty-one squares of this grid so that the numbers in each read more ..

SpongeBobRules24 Feb 15, 2020

+5

1172

5

+1072

Help Please!!!

A point $P$ lies on the hyperbola\[ \frac{x^2}{36} - \frac{y^2}{16} = 1.\]The distance from $P$ to one focus is 7. What is the distance from $P$ to the other focus?

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SpongeBobRules24 Feb 15, 2020

+1

1513

2

help

A pair of kids and a pair of adults decided to compete in a three-legged race. The kids got to start 21 meters ahead of the adults, since they had shorter legs. When they were told to start, the kids hobbled forward at a rate of 1 meter per second, and read more ..

Guest Feb 15, 2020

0

452

1

telescoping series question

Guest Feb 15, 2020

0

419

1

help please!

Guest Feb 15, 2020

0

642

1

Help ASAP!

A bag contains 4 red marbles, 5 yellow marbles, and 6 blue marbles. Three marbles are to be picked out randomly (without replacement). What is the probability that exactly two of them have the same color?

Guest Feb 15, 2020

0

816

1

how do i solve this?

The height (in meters) of a shot cannonball follows a trajectory given by $h(t) = -4.9t^2 + 14t - 0.4$ at time $t$ (in seconds). As an improper fraction, for how long is the cannonball above a height of $6$ meters?

Guest Feb 15, 2020

0

497

1

please help geometry!!

Let be the centroid of The midpoints of sides and are and respectively. Also, is the foot of the altitude from to and is the foot of read more ..

Guest Feb 15, 2020

0

433

1

help

A man starts on a 290 mile trip at 10 a.m. and drives at an average speed of 40 mph until he stops for lunch. After he stops one-half hour for lunch, he finds that he must drive the rest of the way at an average speed of 50mph if he is to arrive by 5pm. read more ..

Guest Feb 15, 2020

-1

875

3

+158

Just a few questions

I don't know if the latex will work, so sorry in advance.

1. Given and , and the general relation for find
read more ..

tanmai79 Feb 15, 2020

+1

846

6

+262

help with complex numbers

i need to find the square root of 3+4i, which is a complex number, i thought the answer was just 2+i because when you square that you get 3+4i, but that's wrong :( are there other square roots of 3+4i that i don't know about?

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atlas9 Feb 15, 2020

0

424

1

Heeeeelp

What is the value of $b+c$ if $x^2+bx+c>0$ only when $x\in (-\infty, -2)\cup(3,\infty)$?

Guest Feb 15, 2020

0

4927

1

help

There are 20 children in a class, and 12 of the children are girls. Of the girls, 8 brought a lunchbox, and of the boys 6 did NOT bring a lunchbox. If a child from the class is chosen at random, what is the probability that the child brought a lunchbox? read more ..

Guest Feb 15, 2020

0

1019

5

help, please asap

1.Jeff the fly starts at the point (0,0) in the coordinate plane. At each step, Jeff takes a step to the right, left, up, or down. After 10 steps, how many different points could Jeff end up at?

2.Ten points are chosen on a circle. read more ..

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Guest Feb 15, 2020

0

618

1

help

Seven-letter words can be formed without repetition from the letters of the word INCLUDE; 5040. How many have the letters N and D separated by exactly two letters?

Guest Feb 15, 2020

0

503

2

Please help me asap!

1. There are six people sitting at a circular table. Each person is either tall or short. Let a be the number of people sitting next to at least one tall person, and let b be the number of people sitting next to at least one short person. How many possible read more ..

Guest Feb 15, 2020

0

439

1

help please!

Prove that is divisible by for all integers n.

Guest Feb 15, 2020

0

460

1

help

Guest Feb 15, 2020

0

696

1

help

Find the number of positive integer solutions to x + 2y + 3z = 100.

Guest Feb 15, 2020

0

672

1

probability

Kenji and Manbu want to play a different game of craps with three dice. Kenji's dice are all 6-sided die while Manbu has one each of a 4-, 6-, and 8-sided die. Manbu reasons with Kenji that his dice will have an equal advantage as (4+6+8)/3 = 18/3=6. So, read more ..

Guest Feb 15, 2020

0

601

5

HELP

how do i find 87= 21^x

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Guest Feb 15, 2020

0

738

1

help

A 40% dye solution is to mixed with a 53% dye solution to get 260L of a 50% solution. How many liters of the 40% and 50% solutions will be needed

Guest Feb 15, 2020

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