Hayden is playing with a toy airplane. The height of the airplane, in metres, is given by the relation h=-3t^2+48, where t is the number of seconds since the plane was
launched.
a) For how long will the airplane be in the air?
b) Determine the time when it reaches its maximum height? What is the maximum
height?
c) At what time(s), rounded to the nearest tenth of a second, will the airplane reach a
height of 30 m?

add an image, and i will answer

step-by-step explanation:

hi there!

step-by-step explanation:

a roof pitch is basically for every inch rise there is 12 inches run.

the height of the roof is also known as the rafter.

formula: rafter^2 = rise^2 + run^2

rafter^2 = 5^2 + 12^2

rafter^2 = 25 + 144

rafter ^2 = 169"^2

the height of the roof from the lowest point to the highest point is 169"^2.

hope this : )

the answer is  

a.

28 ft2

step-by-step explanation: