Question 43387
This is mostly a plug and chug question.

We know that this is our profit equation:
P(x) =2.25x-7000

To find the answer to a and b just plug in 2000 and 5000 respectively for x.
2.25(2000)-7000==>4500-7000==>-2500. She actually creates a loss
2.25(5000)-7000==>11250-7000==>4250.

To find the answer to C you need to set the profit equation equal to 0.
P(x)=2.25x-7000==>0=2.25x-7000==>7000=2.25x==>x=3112

For the cost: 1.75(2000)+7000==>3500