Please help. Will give brainliest

B

Step-by-step explanation:

The 5x-10 = 3x+10 then u find x and put into one of the equations then u get the angle then u use 180- 40 equals 140.

b is the final answer! : )

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 !