My math question on my practice test

Question

You are selling some flowers for a fundraiser you pay $1.50 for each flower plus a flat rate delivery fee of $15 you’re selling the flowers for three dollars at least how many flowers do you need to sell to make a profit

Answer 1

Let x = number of flowers bought and sold

C(x) = cost of x flowers = 1.5x + 15

R(x) = revenue from the sale of x flowers = 3x

P(x) = profit if x flowers are bought and sold = R(x) - C(x) = 1.5x - 15

We make a profit if P(x) > 0.

So, 1.5x - 15 > 0

1.5x > 15

x > 10

A profit is made if more than 10 flowers are sold.