The equation P=4s represents the perimeter P of with side length s. What is the perimeter of with side length 7yd ​?

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Me. i can't figure out this question. give an explanation too. .