Please help! Does anyone know how to work this surface area question out???

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

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