Find the volume of a cone with a base radius of 4m and a height of 12m . Write the exact volume in terms of , and be sure to include the correct unit in your answer.
Ive tried this on my own 4 times, can someone help me?

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?