Hi I have a test coming up on Friday and I am wondering if can help me with me please ​

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?

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

What number should be added to both sides of the equation to complete this square? x^2-10x=7