For 10 miles, he takes = 85 min
then, 1 mile = 85/10 min.
Now, for 8 miles, it would be 85*8/10 = 68 minutes
(h+g)(x) = 3x + 5 + 6x = 9x + 5Answer
(h - g)(x) = 6x - (3x + 5) = 3x- 5 Answer
(h*g)(x) = 6x(3x + 5) = 18x^2 + 30x
(h*g)(2) = 18(4) + 30(2) = 72 + 60 = 132 Answer
I believe x would equal 88 degrees, hope this helps!