I don’t understand how to do this

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?

Factor the polynomial by its greatest common monomial factor.