Rewrite in simplest terms. 8(-5d-9) -3(-6d+10)

Ill mark the brainliest if you me with the these three questions 7,8,9

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)

Solve the equation for y. -1 = 1/3y + 11. will give 5 stars if answered correctly!