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Tanzania [10]
3 years ago
6

An observation deck extends 311 feet out above a valley. The deck sits 261 feet above the valley floor. If an object is dropped

from the observation​ deck, its height h in​ feet, after t​ seconds, is given by h=-16t²+261. How long will it take for the object to be 5 feet above the valley​ floor?
Mathematics
2 answers:
Andreas93 [3]3 years ago
6 0

Answer:

4.12

Step-by-step explanation:

its 4.12 mark me brainiless

mamaluj [8]3 years ago
3 0

Answer:

  • 4 seconds

Step-by-step explanation:

<u>Find the value of t in the following equation:</u>

  • -16t² + 261 = 5
  • -16t² = - 255
  • t² = 255/16
  • t = √255/4 ≈ 4 seconds
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6 0
3 years ago
The population of a small town is 39,668 and has been continuously declining at a 1.5% a year what will the population be in 13
anyanavicka [17]

Answer:  31, 932.74

Step-by-step explanation:

The population of the small town              =  39,668

Yearly rate of decline                                 = 1.5%

Therefore, to calculate 1.5% of 39,668       = 1.5  x 39,668

                                                                         ------------------

                                                                                  100

                                                                      =   595.02

So, the population is declining by 595.02 on yearly basis.

To ascertain what will the population would have declined to in the next 13 years,

We multiply ,                                                = 595.02 x 13

                                                                      =7,735.26

Now population in 13 years                         = 39,668 - 7,735.26

                                                                      = 31,932.74

                 

                                                                                 

6 0
3 years ago
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