a conservationist is tracking the number of a rare type of tree in a forest as it recovers from a fire. During the first 4 years after the fire, she records 2,6,18, and 54 trees. If this trend continues, which expression can be used to find the number of trees after n years? A. 2(3)n-1, B. 2 + 3 (n-1), C. 3(n-1) D.3(2)n-1

its a straight line parallel to the time axis

step-by-step explanation:

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!