Can someone me with 5 and 6? how do i put it? will mark brainliest!

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale

Atreasure chest sinks at a rate no less than 20 feet er second. the floor of the icean is at most at -4,200 feet. will the tresure chest reach the ocean floor in less than 3 minutes? explain.