Which situation is best modeled by a linear function? a) the value of a new automobile that depreciates 20% each year. b) the size of a culture of yeast that doubles in size every 20 minutes. c) the amount an investment is worth when earning 7.2% compounded yearly. d) the amount of interest earned for a year on a savings account earning 5.5% simple interest.

d

Step-by-step explanation:

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hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!