The sales of vinyl records have increased due to a revived popularity. in the year 2012, 50,000 records were sold. every following year, the number of records sold were 1.1 times the number of records sold the previous year. from 2012 to the end of 2016, how many vinyl records were sold?

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!

27 +27 or 27times 2=54

the diffrence is 0

x< -17/2 hope this