Can someone please help me understand ?

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One model for the number of students enrolled in U.S. public high schools as a function of time since 1986 is the formula below.

N = 0.05t2 − 0.42t + 12.33
Here N is the enrollment in millions of students, t is the time in years since 1986, and the model is relevant from 1986 to 1996.

(a) Use functional notation to express the number of students enrolled in U.S. public high schools in the year 1988.

Calculate that value. (Round your answer to one decimal place.)

Calculate N(6).

Oct 3rd, 2015

Thank you for the opportunity to help you with your question!

Here the given function is :

N = 0.05t2 − 0.42t + 12.33

Here N is the enrollment in millions of students, t is the time in years since 1986, and the model is relevant from 1986 to 1996.

(a) Use functional notation to express the number of students enrolled in U.S. public high schools in the year 1988.

here the input to the function is t , which is years since 1986 , so t in 1988  would be = 1988 -1986 = 2

so, the Functional Notion is N(2) = 0.05(2)2 − 0.42(2) + 12.33

calculating the value , N(2) = 0.05*4 - 0.84 +12.33 = 0.2 -0.84 + 12.33 = 11.69 million
rounding to nearest decimal place, we get 11.7 million.


Calculate N(6) = 0.05(6)2 − 0.42(6) + 12.33 = 0.05*36 - 0.42*6 + 12.33 = 11.61 million

Let me know incase you need any further help ! Thanks :)
Sep 22nd, 2015

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Oct 3rd, 2015
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Oct 3rd, 2015
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