What is the difference between a linear model and a linear equation?

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

How many 3/8s are in 6 plz someone tell me now

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost