4. x^2+13x=-42 a. x = -6 or x = -7 b. x = 42/13 or x = 0 c. x = 6 or x = 7 d. x = 0 or x = 2

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

hope this !