Mathematics: The function y = -16t 2 + 486 models the height y in feet of a stone t seconds after it is dropped from the edge of a vertical cliff. how long will it take the stone to hit the ground? round to the nearest hundredth of a second. a. 5.51 seconds b. 0.25 seconds c. 7.79 seconds d. 11.02 seconds

The function y = -16t 2 + 486 models the height y

Ответ:

mfkinnatz

09.01.2022

That is when the height is 0
0=-16t^2+486
solve
add 16t^2 to both sides
16t^2=486
divide both sides by 16
t^2=243/8
sqrt both sides
t=5.511
round
t=5.51 seconds

answer is A

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Ответ:

innocentman69

17.07.2022

Mathematics

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The function y = -16t 2 + 486 models the height y in feet of a stone t seconds after it is dropped from the edge of a vertical cliff. how long will it take the stone to hit the ground? round to the nearest hundredth of a second. a. 5.51 seconds b. 0.25 seconds c. 7.79 seconds d. 11.02 seconds

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