Can someone help me with these any of them??? Thank you

Solve for x, y, and z. show all steps.

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

Quadrilateral efgh was dilated with the origin as the center of dilation to create quadrilateral e'f'g'h'. the quadrilateral was dilated using a scale factor of 2.5. the lengths of the sides of quadrilateral efgh are given. what is the length of side f'g'?