Help pleasee! will mark brainliest (IF CORRECT)

A.

The rate of change is -1, meaning every second the altitude goes down by 10ft

for the second one the rage of change is 2/3, meaning every three days book sales go up by 1000

B.

there is a porportinal liner relationship because the line on the graph is striaght if it wasn’t porpportinal it would be a zigzag line or a a scatter plot

(this applies to both)

the answer is 0.3175 hope that you ^w^

also you might actually want to put this picture up if you want people to solve it luckily i remember this question