Please HELP!! this is for a test

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2