Help please!! will give brainiest :))

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)

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

Aline has a slope of negative 1/4 the past two points -5/4 and 1 what is the equation of the line