31.Simplify completely:
1006 – 4X) – 2(X + 10)

-2 • (3x - 493)

Step-by-step explanation:

 (1006 - 4x) -  2 • (x + 10)

Pulling out like terms :

3.1     Pull out like factors :

  986 - 6x  =   -2 • (3x - 493)

Final result :

 -2 • (3x - 493)

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-2 divided by (3x-493)

Step-by-step explanation:

the two may have that, even a breakdown is probably offered

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