Answer:
18
Step-by-step explanation:
The average rate of change of f(x) in the closed interval [ a, b ] is

here [ a, b ] = [ 1, 5 ]
f(b) = f(5) = 3 × 5² = 75
f(a) = f(1) = 3 × 1² = 3, hence
average rate of change =
=
= 18
650/300 = 2(1/6)
(1/6) of 1 hour = 10mins
The flight took 2hr and 10mins.
The third one hope that helps
Altogether that's $120 dollars so that's how much u need