If tan a=1/7 and tan b=1/3, prove that
cos 2a =sin 4b

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)

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.