Please help me please please please help

4th option

Step-by-step explanation:

Given that the relationship is proportional then the equation relating them is

y = kx ← k is the constant of proportion

To find k use the condition y = 48 , x = 2.5 , then

48 = 2.5k ( divide both sides by 2.5 )

19.2 = k

y = 19.2x ← equation of proportion

12

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.