Does anyone have know if there’s a answer key for this if not pls help.

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42

Percent increase and decrease. original number: 45 new number: 18

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.