A frustum is formed when a plane that is parallel to a cone’s base cuts off the upper portion, as shown below. What is the volume of the frustum? Leave the answer in terms of π.

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

Prove that quadrilateral is a rhombus.

3.4a=57.8 what is the the value of a