Jennifer uses the formula p = 0.5e - 5 to determine the profit (p) she makes from selling any number of erasers (e). last week jennifer had a profit of $63. how many erasers did jennifer sell?

You would have to set the equation to the profit Jennifer got, which you know to be 63 dollars:
63=0.5e-5
To begin solving for e, which represents the number of erasers sold, add five to each side to get e alone.
68=0.5e
Multiply each side by two to get a whole x value on the right side
136=e
Jennifer sold 136 erasers