Which property of addition is shown in if x=1+2i and y-1-2i then x+y=0

Match each expression with its simplified form.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons