Can someone explain to me how they got the answer ?

Mathematics
Tutor: None Selected Time limit: 1 Day

The following table shows the number, in millions, graduating from high school in the United States, in the given year.
t = YearN = Number graduating
19852.83
19872.65
19892.47
19912.29
c) Find the average rate per year during the period 1989 to 1991. (Round your answer to two decimal places.)
(No Response)  

-0.09

 million students per year

(d) Estimate the value of N(1994). (Round your answer to two decimal places.)

(No Response)  

2.02

 million students

Oct 3rd, 2015

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

to get -0.09  they subtracted the value for 1989 from  the one for 1991

2.29-2.47=- 0.19

Then you divide it by 2 to get the average

0.18/2

=-0.09


The second part they got 2.02 by subtracting the average for a year period of 3 years which is (-0.09 x 3)


= 2.29-0.18-0.09

=2.2

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 15th, 2015

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Oct 3rd, 2015
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