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ddvinks6825
14.12.2019 •
Mathematics
Aflare was launched up from the ground with an initial velocity of 176 feet per second (ft/s). the height of the flare t seconds after launch is modeled by the function f(t)=−16t2+176t. how long was the flare in the air before it hit the ground?
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Ответ:
t = -b/2a.
Substituting, we have:
t = -176/2(-16) = 5.5 seconds.
But this is just only the time needed for the flare to reach its maximum height. To solve for the time the flare has been in the air, we multiply the maximum height by 2.
2 x 5.5 seconds = 11 seconds.
Ответ:
49 minutes
Step-by-step explanation:
Given :
Start time = 1:39 p. M
Return time = 2.28 p. M
Time spent Walking dog = difference between the start time and return time
Return time - start time
(2:28 p.m - 1:39p.m) = 49 minutes
Hence, Tiffany spent 49 minutes walking her dog