Pre calculus help with # 8 and # 9 please

What is the result of converting 60 ounces to pounds remember there are 16 ounces in a pound

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.