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luda_lava [24]
3 years ago
10

The Valley High School student council is planning a dance. The

Mathematics
1 answer:
DerKrebs [107]3 years ago
3 0

Answer:

$3.90

Step-by-step explanation:

its B

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Step-by-step explanation:

The height of the swipe card is given by :

h(t)=-3t^2+15t+18 .....(1)

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For maximum height, put dh/dt = 0

So,

\dfrac{d}{dt}(-3t^2+15t+18)=0\\\\-9t+15=0\\\\t=\dfrac{15}{9}\\\\t=1.67\ s

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Now, put t = 1.67 s in equation (1).

h(1.67)=-3(1.67)^2+15(1.67)+18\\\\=34.68\ feet

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