Felicia is 9 years old. Her neighbor Katie is 10 years old. How much older is Katie than Felicia?

1 year

Step-by-step explanation:

Subtract 9 from 10 to get your answer, please thank me :)

1 year

Step-by-step explanation:

older person's age - younger person's age = age difference

10 - 9 = 1

b i think

step-by-step explanation:

not really sure

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!