Find the unit rate of 90 miles/2 hours, IN FEET PER SECOND! can you please do it step by step plz?

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

1. a parachutist is 800 feet above the ground when she opens her parachute. she then falls at a constant rate of 5 feet per second. select the equation that represents this situation. h = -800t + 5 y = -5x + 800 h = 5t - 800 y = 800x + 5 i need