If a is a rational number and b is an irrational number, then the sum a + b is

C: Irrational

Explanation:

the reason i chose C because when you add a rational and irrational number together you still get a repeating number which is irrational.

For Example: Take a rational number 5 and Pi

if you ad those together 5+3.1415... you still get a repeating decimal, and repeating decimals are also irrational numbers.

Hope this helps :D

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!

15: 24

62.5%

step-by-step explanation: