Which expression is equivalent to 83 ⋅ 8–7?

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)