PLEASE HELP
Brianlist will be marked

Randy left town on his bicycle, traveling
at an average of 16 miles per hour. Four
hours later, his older brother, Jimmy, went
looking for Randy on his motorcycle. Jimmy
traveled at an average of 48 miles per hour.
How long would it take Jimmy to catch up
to Randy?

One hour and 20 minutes.

Step-by-step explanation:

1 hour and 20 min. or 1 hour and 30 min

(This is a very confusing thing for me that's why it's either those 2)

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!