Equations With One Variable Practice Test

A fundraiser’s profit is modeled by $P=12n-35$, where $P$ is profit in dollars and $n$ is the number of items sold. If the profit was $49$ dollars, what is the value of $n$?

A shipping company uses the formula $C=2.5w+4$ for cost $C$ (in dollars) based on package weight $w$ (in pounds). If a package costs $19$ dollars to ship, what is the value of $w$?