This is a math test and i really need help. ill give brainliest

Oh boy, here we go:

17) 20

18) 135

19) 142

20) 14

21) No

10) B (I believe)

11) A

12) A

13) A

14) A

15) A (I don't know why these are all A...)

16) C (Yay, it's not A)

Step-by-step explanation:

I think you need this ASAP and don't want to wait for me to type this all out...

17.

45 + 5x + 35 = 180

5x + 80 = 180

x = 20

18.

5x + 35

5(20) + 35 = 135 degrees

19. Choice D. 142

20. Choice C

5x - 10 = 60

x = 14

21. Yes

10. Choice B (-3, -5)

11. Choice A (-3, 2)

12. Choice B, reflection across the y-axis

13. Choice A, y-axis

14. Choice A

15. Choice A

16. Choice A

there is no question content here, but you for the free points! : 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!