Answer:
7.5 min/ mile
Step-by-step explanation:
Divide the time taken in minutes by the distance in miles
3 hours = 3 × 60 = 180 mins
3 hours 15 min = 180 + 15 = 195 mins
Average time = = 7.5 min/ mile
Enter your answer in decimal form. x=
1 answer:
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Answer:
10
Step-by-step explanation:
Ground level is where h = 0, so solve the equation ...
h(x) = 0
-5(x -4)^2 +180 = 0 . . . . substitute for h(x)
(x -4)^2 = 36 . . . . . . . . . . divide by -5, add 36
x -4 = 6 . . . . . . . . . . . . . . positive square root*
x = 10 . . . . . . add 4
The object will hit the ground 10 seconds after launch.
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* The negative square root also gives an answer that satisfies the equation, but is not in the practical domain. That answer would be x = -2. The equation is only useful for time at and after the launch time: x ≥ 0.
