Notice the grid, the points are (-5, -2) and (4, -1), thus
Your insight that the function values differ by 5 every time is very important. So your f(x) will contain 5x as a term. You have to find a constant to add or subtract to make sure f(1)=-2.
f(x) = 5x-7 does the job.
Answer:
$1930
Step-by-step explanation:
770 + 24.64 (48-1)
there are 4 quarters in a year so you do 48 terms instead of 12.