kellie

1.Pipe A can fill a tank in 4 hours and Pipe B can fill a tank in 3 hours. How long will it take for the tank to be filled, if both pipes are filling the tank at the same time.- I know there's a certain formula on how to do this, but i cant find it any where.

Answer: 1 5/7 hours

2. 2^x= 1/8

Answer: x=-3

THANKS FOR THE HELP

3x+2y-3z= -2

2x-5y+2z= -2

4x-3y+4z= 10

I have done this problem at least five times and I can't get all the answers. I use the addition method for equation 1 and 2. I get 19y-12z= -2. Then i do the same for 2 and 3. I get y=2. I know y=2 is correct, but I don't know how to solve the rest. The book only shows one way to do these equations. The book says you should get to equations with two variable in each resulting equations. Well not in this case. The answers are {1,2,3} if that helps. Please and thanks!

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solve for t: s= 1/2at^2

Please help!

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