Question

I need help on these as well

Answer 1

For number 5, the triangle sum theorem states that all angles inside of a triangle must add up to 180 degrees, so we have 30+90+66+x. Right angles are 90 degrees.

186+x=180

x=-6

For number 6, same rule applies here.

60+30x+90 = 180.

150+30x=180

x=1