I need help am i right

40.5

Step-by-step explanation:

you need to add both bases

9+4.5=13.5

then divide that by two

13.5/2=6.75

the multiply by six

6.75*6=40.5

No, you are wrong, you only accounted for part of it.

the answer is (C) 40.5 cm^2

Step-by-step explanation:

Add the two wing triangles to your 27 cm^2

2(6x2.25x0.5)=13.5

27+13.5=40.5

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!