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Leno4ka [110]
3 years ago
9

A professor uses a video camera to record the motion of an object falling from a height of 250 meters. The function f(x) = –5x2

+ 250 can be used to represent the approximate height of the object off the ground after x seconds. Which is the best estimate for the amount of time elapsed when the object is 120 meters off the ground? 4 seconds 5 seconds 6 seconds 7 seconds
Mathematics
2 answers:
GaryK [48]3 years ago
6 0
120 = - 5 x² + 250
5 x² = 250 - 120
5 x² = 130
x² = 130 : 5 = 26
x = √26 = 5.099 s ≈ 5 s
Answer: B ) 5 seconds
anyanavicka [17]3 years ago
5 0

Answer:

B. 5

Step-by-step explanation:

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