What does the equation x2 + y2 = 16 represent as a region in the set of real numbers3?

Let us say that x and y are points that are located in the Cartesian coordinate. The sum of the squares of x and y gives the square of the radius of the circle. Therefore the equation x^2 + y^2 = 16 given that x and y are real numbers represent a Circle.

A circle has a general formula of x^2 + y^2 = r^2

the red lines denote the population of the bacteria after 35 hours. that would be 2,409.24. the y-intercept is the blue line which is 800 because that is the starting point. the equation used to make the graph is 800(1.032)^h, where h is the number of hours.

step-by-step explanation:

my guess would be b and d, but i didn’t actually get out the pen and paper. lol