Which equation can be used to find the value of x if the shortest side, y, measures 2.1 m? 2 x minus 2.1 equals 7.5 4.2 plus y equals 7.5 y minus 4.2 equals 7.5 2.1 plus 2 x equals 7.5

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)