I think it’s about 134.13 ft
to find the circle the formula is pi times the radius squared so:
12.5 x 12.5 = 156.25
156.25 x pi ≈ 490.8738 ft squared
to find the square it’s base x height so:
25 x 25 = 625
then to find the shaded part you just find the difference:
625 - 490.87 = 134.13 ft
The first thing we are going to do for this case is define variables.
We have then:
x: number of days
y: number of pages remaining.
We write the linear equation that models the problem:

The intersection with the vertical axis is:
We evaluate x = 0:

We get the point:

The intersection with the horizontal axis is:
We evaluate y = 0:


We get the point:

Answer:
The graph is:

Graph located in the bottom left.
90 miles per hour is its average speed.