1. Choose the justification for the step below. 7(3+x) = 14
21+7x = 14
a) additive property of equality
b) multiplication/division property of equality
c) distribution
d) none of these
PLEASE HELP

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)