What is the equation of a circle whose center is at the origin and whose radius is 9?

The chart below shows the distribution of weeds in yard

Examine the following sets of events. set a: {1, 5, 7, 9, 14} set b: {2, 5, 6, 8, 14, 17} which of the following represents the intersection of set a and set b ? {∅} {5, 14} {1, 2, 5, 6, 7, 8, 9, 14, 17} {1, 2, 6, 7, 8, 9, 17}

Solve the system of equations. y= 2x y= x^2 - 15