When you multiply powers with the same base, you sum the exponents:

So, in this case, you have

Your answer would be 9 hours
Answer:
~1.29 inches
Step-by-step explanation:
C = 2πr
C = 3r + 4.25
2πr = 3r + 4.25
2πr - 3r = 4.25
r(2π-3) = 4.25
r = 4.25/(2π-3) ≈ 1.29
So, 6/7*56/1
56*6/7
336/7
the answer is 48