What's the equation to find x? what's the degree of each angle

3x +84= 180,

x= 32

Step-by-step explanation:

m∠1 +m∠2= 180° (adj. ∠s on a str. line)

(x +84)° +(2x)°= 180°

x +84 +2x= 180

3x +84= 180

Solving the equation:

3x= 180 -84 (-84 on both sides)

3x= 96

x= 96 ÷3

x= 32

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

the answer is 99.