Which of the following functions has an inverse that is not a function? f(x) = (x-1)3+2 or f (x) = 2x or f(x) = x (x-1) or f(x) = 1/2x - 1/2

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)