3. Angle 1 and angle 2 are complementary angles. The measure of angle 1 is 18". The measure of angle 2 is 12x. Find the value of x.

x = 6

Step-by-step explanation:

Complementary angles always equal 90 degrees so something multiplied by 12 will have to equal something that will add up with 18 to get 90 so

12 × 6 = 72 and 72 + 18 = 90 Hope this helps you!

add an image !

step-by-step explanation:

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!