Can someone explain to me how they got the answer ?

Mathematics
Tutor: None Selected Time limit: 1 Day

The following table compares dollar values per standard cord (128 cubic feet) to values per thousand board-feet (MBF) under the Scribner scale for trees 12 inches in diameter.

Value per cordValue per MBF Scribner
$20$68.00
$24$81.60
$28$95.20
$36$122.40

(a) Make a table showing the average rate of change for each interval of values. (Give your answers correct to one decimal place.)

Interval20 to 2424 to 2828 to 36
Rate of change(No Response)  

3.4

(No Response)  

3.4

(No Response)  

3.4


Oct 3rd, 2015

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

interval -                       20 to 24

rate of change  =      MBF Scribner change / interval change

                               = 81.60- 68.00 / 24-20

                               =  13.6 / 4

                              = 3.4...............answer

 

interval -                       24 to 28

rate of change  =       MBF Scribner change / interval change

                               = 95.20 - 81.60 / 28 - 24

                               = 13.6  / 4

                              = 3.4...............answer



interval -                       28 to 36

rate of change  =       MBF Scribner change / interval change

                               = 122.40  -95.20  / 36 - 28

                               = 27.2  / 8

                              = 3.4...............answer



Interval20 to 2424 to 2828 to 36
Rate of change                       

3.4

                           

3.4

                                 

3.4



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

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