Answer:
What is 20 percent of 500.? = 100.
Step-by-step explanation:

This is what is in the middle of the second paragraph. That statement is correct.
I don't know that it is any simpler or not, but what they have done in the answer is rationalize the denominator. That means that the denominator is no longer under the square root sign.
To get that result, you multiply numerator and denominator by √F
When you do that, your get

This results in the middle answer.

15.2 because the 8 is 5 and above with brings it to the nearest 10th;
if it was 4 and under it would be rounded to 15.1
I got the answer as 10,560 per min
Answer:
t = 7s + 4
Step-by-step explanation:
The goal is to get t alone. So we should move 7s to the other side of the equals to sign. When we move 7s to the other side of the equals to sign the sign changes to -7s. There are no like terms to be collected so the answer should be 7s + 4 for t.