Please help, I will give brainliest!

A radical equation is being solved below, but has missing work.

a) Fill in the missing steps that are blank. To help, look at each line and compare it to the steps in the previous line to see what changed or what calculations were made to get to the next step.

b) Check for Extraneous Solutions.

idek

step-by-step explanation:

answer: it's d

step-by-step explanation:

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