If the length of a rectangle is 5a^2 and the width is 7ab^2 what is the area of the rectangle?

Can someone me and do the problem plz so i can understand it more better

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?