PLEASE HELP

How do I solve 7,9, and 10 also what are the answers?

For each sentence below, find the value of x that makes each sentence true. (515) 5 = 25* x= (813)2 = 4* x=

Usan threw a softball 42 yards on her first try and 5112 yards on her second try. how much farther did she throw the softball on her second try than her first? express your answer in feet and inches. 9 ft 12 in. 28 ft 12 in. 28 ft 6 in.

Let f(x) = x + 2 and g(x) = x2 + 4. find f(g(f(