Answer:
6.28
Step-by-step explanation:
1/2 x 3.14 x 2^2 = 6.28
1) 9+6 = 15
15+31 = 46
2) (12.5+0) + (1+43.5)
12.5+44.5
= 57
So answer to number 1 is 46
Answer to number 2 is 57
Answer:
Pipe 1 twice as fast as pipe 2.
(Pipe 1 time * Pipe 2 time) / (Pipe 1 time + Pipe 2 time) = combined time
(x * (x/2)) / (x + x/2) = 10
(x^2/2) / 1.5 x = 10
x^2 / 2 = 15 x
x^2 /2 - 15 x = 0
x = 30 (slow pipe)
x/2 = 15 (fast pipe)
So it would take 30 hours using the slow pipe only.
Step-by-step explanation:
I think the answer should be 12 but......
