Cumulative Practice
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Apply inverse operations to isolate t.
B
To solve the given formula for t, we will use the Properties of Equality to apply inverse operations on the formula. Remember, only like terms can be combined.
LHS-11=RHS-11
.LHS /1.6.=.RHS /1.6.
Rearrange equation
Note that in this case, we were asked to solve for the used therms t, given the formula for the cost. A solution of t= C-111.6 means that we have solved for the number of therms used each month. Therefore, the correct option is B.