Question in description! Pls help

Question

1. if a tire has a rim size of 17 inches and a circumference of 100.48 inches, find the width of one sidewall (in inches).
2. A computer monitor has an aspect ratio of 7:4 and the height of the monitor is 19 inches. How wide is the screen?

Answer 1

Question 1

If I understand the problem correctly--the inner circumference of the tire is 17" and the outside circumference is 100.48".

1. The total radius of the tire (t) is computed by solving πt²=100.48→t=√100.48/π = 5.6554 in.
2. The radius of the inner rim of the tire (r) is computer by solving πr²=17 → r-√17/π = 2.3262 in.
3. The side wall is the difference between the two found radii above t-r = 3.3292 in.

Question 2 This answer assumes that the monitor is wider than it is tall.

1. The height of the monitor can be found by setting up and solving the following proportion where w is the width of the monitor:

7 = w → w= 133 = 33.25

4 19 4