Hi Connor.
First, let's define the formula for finding the circumference of a circle (as a tire is a circle). To find the circumference, multiply by diameter by Pi, or [tex] \pi [/tex], or you can multiply the radius by 2 and then multiply that product by Pi. Given that we already have our diameter, let's use [tex] \pi [/tex]D.
3.14 x 2.5 = 7.85.
For part A: The circumference of the tire is 7.85 ft^2.
Now, to solve for part B; since we have our circumference, or the full rotation of the tire, we need to divide 1 mile (5,280 ft) by that number.
5,280 / 7.85 = 672.611
For part B: The tire will have to rotate about 673 times.
I hope this helps!
