1. Write in simplify radical form by rationalizing the denominator
2√2+1/-5√2+3
2. An aquarium holds 7700 liters of water. There are two pipes that can be use to fill the tank. The first pipe alone can fill the tank in 77 minutes. The second pipe can fill the tank in 44 minutes by itself. When both pipes are working together, how long does it take them to fill the tank?
3. Solve for z. Where z is a real number, if there is more than one solution seperate them by commas.
√z+10=3
2007-06-10 01:56:42 · 4 answers · asked by CHRISTOPHER R 1 in Science & Mathematics ➔ Mathematics
1.
I assume this is:
(2√2+1)/(-5√2+3)
multiply the top and bottom by (-5√2-3)
(2√2+1)(-5√2-3) / (-5√2+3)(-5√2-3)
= [(-10√4) + 1(-5√2) - 6√2 - 3] / (25*2 - 9)
= (-20 - 5√2 - 6√2 - 3) / (50 - 9)
= (-23 - 11√2) / 41
2.
(together)/(alone) + (together)/(alone) = 1
(x / 77) + (x / 44) = 1
multiply everything by 44*77
44x + 77x = 44*77*1
121 x = 3388
x = 28 minutes
3.
I assume it's
√(z + 10) = 3
z + 10 = 3^2
z + 10 = 9
z = -1
2007-06-10 02:10:23 · answer #1 · answered by Mathematica 7 · 0⤊ 0⤋
1. The equation as written is confusing. Use parentheses.
2. 1/44 +1/77 = 1/t... t = 28
3. âz = -7...z = 49
2007-06-10 09:10:11 · answer #2 · answered by gebobs 6 · 0⤊ 0⤋
Are we doing your homework for you?!
It would be helpful if you listed what you didn't understand so we can help.
You can get number 1 and 3 from a graphing calculator if you just need an answer.
2007-06-10 09:06:45 · answer #3 · answered by Anonymous · 0⤊ 0⤋
come on. if u try hard u can do it urself
2007-06-10 09:05:16 · answer #4 · answered by tvrocks.267 3 · 0⤊ 0⤋