30 POINTS
using the following equation, find the center and radius of the circle.
x^2 + 2x + y^2 + 4y= 20

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

Find the slope of the line passing through a pair of points