I’m confused. Can someone help me?

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

That table shows measurements (in invhes$ from cubes with different side lengths. which pairs of variables have a linear relationship? check all that apply

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'