The amount of water in a tank, T, after m minutes is given by T=55+8m. How many gallons of water are in the tank after 20 minutes?

215

Step-by-step explanation:

T = 55 + 8m

This is your equation.  You want to find out how many gallons of water will be in the tank after 20 minutes.  According to the description, T is the amount of water in the tank and m is the time that is passed in minutes.  You have to plug in the value given into the variable that matches.

For this problem, the value goes into the variable m.  Solve for T.

T = 55 + 8(20)

T = 55 + 160

T = 215

After 20 minutes, there will be 215 gallons in the tank.

215 gallons

Step-by-step explanation:

The equation given is:

T= 55 + 8m

where T is the amount of water in a tank and m is the number of minutes. We want to find out the amount of water in the tank after 20 minutes. Since m is our variable for minutes, substitute 20 in for m.  

T=55+8m

m=20

T=55+8(20)

Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.

First, multiply 8 and 20.

T=55+160

Then, add 55 and 160

T=215

T=215 gallons

After 20 minutes, there will be 215 gallons in the tank.

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