Check the picture below
notice, the run is half 35
recall slope = rise/run
3 tens is 3 * 10 = 30
9 ones is 9 * 1 = 9
30 + 9 = 39
Answer: 39
Find out how much over the 10 years whatever it says and then use that to explain if it's worth is
What are you trying to find?
You can answer this problem in two different ways: the first being (17 - 5) * x, and the second being 12 * x.