34 points will mark brainylest -2[3x-(b+2x)+(x-3b)] i have the answer but can figure out how to write it out -4x+8b plz !

-2[3x-b-2x+x-3b]

-2[(3x - 2x + x) + (-b -3b)]

-2[2x - 4b]

-4x + 8b

However you are answering, the way you wrote it should be fine. I'm just going to check to see that it is correct.

-2[3x - (b + 2x) + (x - 3b)] Remove the inside brackets ()

-2[3x - b - 2x + x - 3b] Collect like terms inside the square brackets.

-2[ 3x - 2x + x - b - 3b]

-2[2x - 4b] Now remove the square brackets.

-4x + 8b So your answer and mine agree.

Just write it as you see it.

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