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Post New Question
All Questions
+0
231234 Questions
+5
604
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 $S/T$.
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SpongeBobRules24
Feb 15, 2020
+6
634
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
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SpongeBobRules24
Feb 15, 2020
+5
1078
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
1471
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
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Guest
Feb 15, 2020
0
377
1
telescoping series question
Find
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Guest
Feb 15, 2020
0
344
1
help please!
Compute
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Guest
Feb 15, 2020
0
543
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?
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Guest
Feb 15, 2020
0
724
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?
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Guest
Feb 15, 2020
0
417
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
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Guest
Feb 15, 2020
0
353
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.
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Guest
Feb 15, 2020
-1
802
3
+157
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
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tanmai79
Feb 15, 2020
+1
790
6
+261
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
346
1
Heeeeelp
What is the value of $b+c$ if $x^2+bx+c>0$ only when $x\in (-\infty, -2)\cup(3,\infty)$?
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Guest
Feb 15, 2020
0
4841
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?
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Guest
Feb 15, 2020
0
936
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.
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Guest
Feb 15, 2020
0
520
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?
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Guest
Feb 15, 2020
0
422
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
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Guest
Feb 15, 2020
0
362
1
help please!
Prove that is divisible by for all integers n.
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Guest
Feb 15, 2020
0
380
1
help
Compute
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Guest
Feb 15, 2020
0
617
1
help
Find the number of positive integer solutions to x + 2y + 3z = 100.
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Guest
Feb 15, 2020
0
571
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,
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Guest
Feb 15, 2020
0
521
5
HELP
how do i find 87= 21^x
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Guest
Feb 15, 2020
0
650
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
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Guest
Feb 15, 2020
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