What’s the correct answer for this?

9

Step-by-step explanation:

According to the tangent secant theorem,

If a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment So,

(AE)²= (EC)(DC)

36 = 4(DC)

DC = 36/4

DC = 9

in mathematics, a function is a relationship between two variables such that the value of one of the variables, called the dependent variable, is determined by the value of the other variable, called the independent variable. there is a specific term we use to describe the set of independent variables of a function.