For every 140 feet that kelly rides on her bicycle, the wheels turn 20 times. About how many times do the wheels turn in 5 miles? ( 1 mile = 5,280 feet)

Approximately 3771 times

Step-by-step explanation:

Let x be the number of times the wheels turn in 5 miles.

Given that, 1mile = 5,280ft

Thus, 5 miles=5 × 5,280ft=26400ft

From the question ,we can deduce the following ratios :

140 ft : 20 mins

26400ft : x

Cross multiply;

Divide through by 140.

step-by-step explanation: 4 cause 2+2=4

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!