Start by finding the mean of the gas range:
21+24/2= 22.5
Multiply 22.5 by 20
22.5 x 20= 450
Your answer is 450 miles
The answer to that is 2,180,000
The work is on the picture attached, but a = 1
Hope this helps!!
180-130=50
180-96=84
angles in a triangle add up to 180
50+84=134
180-134=46
x=46 degrees