b. 18
step-by-step explanation:
so the equation for this is:
ab^2=acâ‹…ad
ab being the top length of 6 and ac being the length of 2 and ad being the length of x. let's plug into the equation:
6^2 = 2x
now lets just solve for x:
36 = 2x
18 = x
i hope that !