Mathematics, 07.12.2021 03:30 theweave2776

PLS HELP!!! A cannonball is fired with an initial upward velocity of 20 ft/min. Use the equation d(t) = 20t − 5t2
,
where d(t) is the distance from the ground in feet and t is the time in minutes.
a) Calculate its altitude after 3 minutes.

b) How high is it at its highest?

c) When is it at its highest?

d) When does it return to the ground?

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