Simplify the expression. 9×y^2 - 11xy^2

I'm so close to finishing all these.

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

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)