Video games sold: x
revenue function: r(x) = 60x
cost function: c(x) = 12 + 7x
profit function: p(x) =

We are given
x as the number of video games sold
the function for the revenue
and the function or the cost

We are asked fro the profit function.

Profit has the general formula
Profit = Revenue - Cost

Substituting
P(x) = R(x) - C(x)
P(x) = 60x - (12 + 7x)
P(x) = 60x - 12 - 7x
P(x) = 53x - 12

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction