Coal is pouring from a high conveyor belt onto a conical pile. The conical pile has a semi-vertical angle of 30°, and at time t the radius of the base is r. Find the height of the cone in terms of r, and hence show that the volume V of the cone is

V=(pi x r^3 x root 3)/ 3

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse.a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?

Which of the following is the sum of 3 1/6 + 6 3/8?

What is the value of the discrimination for the quadratic equation 0=×2+2+×2