Joe and chris each have a lawn mowing business. Joe charges 40 to mow 2 acres. Chris charges 30 to mow 1.2 acres. Who charges more per acre? What is the answer

These question are hard can you me with answers

12 point are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr?

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y