The answer is 21.
I am not sure if you're looking for the answer, or the steps... get back to me foor help.
The -3 in f(-3) is the X coordinate, so you need to find where the line is on the Y coordinate at that point.
The line is at Y = -9
Answer:

Step-by-step explanation:
15 can go into both 45 and 150 so you divide both into that
45/15 is 3
150/15=10

28.3 is the answer in 1 decimal place!
We have the equation:

So then we need to distribute -7p to the parentheses:

Then we need to set the equation equal to 0, so we must subtract 21 on both sides:

Then we need to factor this. So we end up with:

This is as much as this can be factored, so <u>we cannot go any further</u>.