Find the values of x and a please!!

The two-way frequency table below shows data on playing a sport and playing a musical instrument for students in a class.

How do you solving the solution of each system using elimination?

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2