Note: on 11,12, and 13, factor out an x. For example on 11 x(x^2-9x) then graph. Without a calculator, name the zeros (include multiplicity is any) and sketch the graph.
11. f(x) = x*3 - 9x^2
12. f(x) = x*3 - 4x^2 - 5x
13. f(x) = 2x^3 + 7x - 4x
14. f(x) = -3x(x -- 4)(x+3)^2
15. f(x) = 5x(x - 2)²(x - 5)

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)