PLEASE HELP IM TAKING A TEST!! The graph of the relationship of number of dinners and cost is a line that contains the points (2,12), (4,24), (6,36) and (8,48). What is the constant of proportionality?

each part is getting multiplied by two.

Step-by-step explanation:

(2,12)x2 (4,24)

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.