$256.75
Add $178 + $98.25= $276.25
Then $276.25 - $19.50 = $256.75

if you have already covered slopes, you could also get it that way, in fact is simpler that way.
Answer:
I believe 4 but I'm not that good at math but 4
It would fly 147 miles in 3 hours
Circle = (x-h)^2 + (y-k)^2 = r^2
Center is (h,k) h = -5, k = 2
Radius is 4, r = 4
(x - -5)^2 + (y - 2)^2 = 4^2
(x + 5)^2 + (y - 2)^2 = 16