16. You use the equation 4-26=2-18 to calculate the amount of money M in your account at the end of the month,
where is the number of lawns mowed and g is the number of gallons of gas used.
a. Solve the equation for M.
b. What does 130 represent in your equation from part (a)?
c. How much money is in your acount at the end of the month when you mow 7 lawns and use 11 gallons of gas?