When driving the 9 hour trip home, Sharon drove 450 miles on the interstate and 165 miles on country roads. Her speed on the interstate was 20 more than on country roads. What was her speed, in miles per hour, on country roads?

step-by-step explanation:

where is the questions

yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36