Answer:

35 – m is the expression used to determine the number of gallons left in the tank after m minutes.

Step-by-step explanation:

Given:

• Tank with 35 gallons of water is leaking at a rate of gallon per minute

Calculations:

• Let “m” represent the number of minutes spent
• Number of gallons left in the tank = initial amount of water present – leaked amount of water
• [tex]=35-m * 1=35-m[/tex]
• The required expression is 35 – m