Tìm x Z, sao cho: a)(x1)2 1 b)72x6 49
c) (2x16)7 128
e ) 1 0 5  (1 3 5  7 x ) : 9  9 7 f) [3(x2):7]4120 g) x(x1)0
h)x3x2 28:23

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)