HELPPP TEST RN HELPP WILL GIVE BRAINLIEST

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. 4x^2 + 20x + 25 = 0

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