Find the value of k so given line has slope of m 3x-ky-4=2; m=-1/2

Natasha spent 1 1/2 hours on the beach. she fell asleep for 3/4 of the time she was on the beach and then woke up with a terrible sunburn.how many hours was natasha asleep on the beach?

The graph shows the function f(x) = (2.5)x was horizontally translated left by a value of h to get the function g(x) = (2.5)x–h.

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?