Math League practice: 11/30/20

Determine exactly the area of the region in the third quadrant for which

In the summer of 2019, Connor earned $13 for each lawn he mowed. This past summer he got a raise and earned $15 per lawn. Connor also mowed exactly twice as many lawns this past summer as in 2019. If he earned exactly $187 more in 2020 than in 2019, how many lawns did he mow this past summer of 2020?

If the surface area and volume of a cube are equal, determine exactly the length of each of the cube's edges.

The volume of a cone is twice the volume of a cylinder. If the bases of the cone and cylinder are the same, and the height of the cone is 6 inches, determine exactly the height of the cylinder.