Can someone help me with this

How do i put 3(x+7) in distributive property

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1. a) y = 1 b) y = 3 c) y = 0 eliminate d) y = -3

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok