Mr. Smith invested $2,500 in a savings account that earns 3% interest compounded annually. He made
no additional deposits or withdrawals. Which
expression can be used to determine the number of
dollars in this account at the end of 4 years?
1) 2500(1+0.03)
2) 2500(1+0.3)
3) 2500(1 +0.04)
4) 2500(1+0.4)

i not know

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!