6. Marcie has a 30 year adjustable rate mortgage with a fixed rate for the first 5 years. In the 6th
year, the interest rate rises to 4.9%. The remaining balance at the end of the 5th years is
$317,783.30. What is the monthly payment in the 6th year?
$1,686.56
$1,059.26
$1,878.56
$1,839.26

1. this graph is actually an area. it is demarcated by the vertical line x=7. everything to the right of this line (excluding the line itself) is part of the graph.

2. this graph is also an area, but this time to the left of x=17, and inclusive of the line itself (because of the  ≤)