The sum of a number, 1/6 of that number, 2/1/2 of that number, and 7 is 12/1/2. find that number

Factor this polynomial completely x^2-64

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.

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.