Find the slope of a line perpendicular to each given line

The expression 6x2 gives the surface area of a cube, and the expression x3 gives the volume of a cube, where x is the length of one side of the cube. find the surface area and the volume of a cube with a side length of 6m

Is a positive integer raised to a negative power always positive

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)