Can someone please help me with these questions?

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

Evaluate the expression. (9 + 5)(3 + 2)0