4. A tank containing 35 gallons of water is leaking at a rate of gallon per minute. Write an expression to determine the number of gallons left in the tank after m minutes.

The expression 35 - m is used to determine the number of gallons left in the tank after m minutes.Solution:Given that a tank containing 35 gallons of water is leaking at a rate of gallon per minute.Let "m" represent the number of minutes spentNumber of gallons left in the tank = initial amount of water present – leaked amount of water Number of gallons of water left = 35 gallons – number of minutes spent [tex]\times[/tex] rate of leakage. Number of gallons of water left = 35 gallons – m minutes [tex]\times[/tex] 1 gallons per minute [tex]= 35 - m \times 1 = 35 - m[/tex]Hence, the required expression is 35 – m