Can someone please help me with 10 and 11

Will give brainliest summations with algebraic expressions image shown

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

Choose the equation below that represents the line that passes through the point (2, 4) and has a slope of 3. a) y − 4 = 3(x − 2) b) y − 2 = 3(x − 4) c) y + 4 = 3(x + 2) d) y + 2 = 3(x + 4)