What is the equation in slope form of line passing through (1,9) and(-1,11)

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.