A) in the step shown of the construction of a line through a point that is perpendicular to the given line, why must the compass point be placed on points a and b? how would the construction be different if the compass point were placed at random points on the original line?

3x + 18 = 147°

step-by-step explanation:

3x + 18 = 147°, because the value of the central angle is equal to the value of the arc formed by it.

i hope i you.

boxplot e is the answer

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.