Question 74201
P(x)=2.25x -7000

you would first substitute 2000 with x to find the profit if she sells 2000 units.
P (2000)= -$2500

Now you need to find the profit for 5000 units.
P (5000) = $4250

Finally you need to know what the break-even point of the sales are.
The break-even point of sale is P(x)=0 if 2.25x - 7000 = 0
Then x = 7000/2.25 = 3111.11 units

Good Luck!!