David's family rented a boat for a flat fee of $20 plus an hourly, X. David's family rented the boat for 4 hours. The equation 4x + 20 = 60 represents, in dollars, what David's family paid for renting the boat. What is the hourly rate for renting the boat?

$10

Step-by-step explanation:

4x + 20 = 60

-20 from each side

4x = 40

divide each side by 4

x = 10

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!

49%

step-by-step explanation:

when you realize that you dont know just realize i just took a test and im so smart