How can i answer this?

What is the 12th term of b(n)=-4-2(n-1)

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a