Selena reduced the time it takes her to run a mile from 8 minutes to 6 minutes. What was Selena's percent decrease in the time it takes her to run a mile?

I think the answer might be 0.48 because that is 8 percent of 6, but im not positive

Selena reduced the time it takes her to run a mile from 8 minutes to 6 minutes. What was Selena's percent decrease in the time it takes her to run a mile?

It is 25%

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!