Answer:
Part a) 0.20 revolutions per foot of distance traveled
Part b) The slope of the graph is

Explanation:
step 1
Find the slope
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form
or

In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin
Let
x ----> the number of revolutions
y ----> the distance traveled in feet
we have the point (2,10) ----> see the graph
Find the value of the constant of proportionality k

Remember that in a direct variation the constant k is equal to the slope m
therefore
The slope m is equal to

The linear equation is

step 2
How many revolutions does Charmaine make per foot of distance traveled?
For y=1
substitute in the equation and solve for x

