9/100 = 0.09.
it depends on your denominator
500 = 200 + 20h is our equation.
Subtract 200 from both sides
300 = 20h
Divide by 20
300/20 = 15.
It will take 15 hours to get 500 points.
Hope this helps!
9) C.
10)A.
11) $75
Those are all the answers that you needed.
Answer:

Step-by-step explanation:
√a^4 is the same as:
√a × √a × √a × √a
group them as 2 pairs of
(√a × √a) × (√a × √a)
which makes
a × a
which is the same as 
4.5 • 10-5 = 40
2.4 • 10-2 = 22