Which is the standard equation for a circle centered at the origin with radius
A. x^2= y^2+r^2
B. x+y=r
C. x^2+ y^2 = r
D. x^2 +y^2 = r^2

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

What is the result of adding the system of equations? 2x+y=4 3x-y=6