7xy - 2z use the expression above to identify the terms, factors, coefficient(s), and constant.

Which graph represents the following piecewise defined function?

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip

Ineed with math stuff it involves graphs