Which equation would help determine the measure of angle D?

A. y+30+80=180
B. x-10=75
C. 80+y+30=180
D. 80=y+30

Match each expression with its simplified form.

Amap has a scale of 3.5 inches = 20 kilometers. if the distance between two cities on the map is 4.9 inches, what is the actual distance between the two cities?

Which of the following lines would not have its equation change after a dilation with a center at the origin? (1) y=x+3 (2) y=10 (3) y=4x (4) x=6