What is an equation of the line that passes through the point (1, 3) and is perpendicular to the line x+3y=9

The quadratic function h(t) = -16.1t^2 + 150 models a balls height, in feet, over time, in seconds, after its dropped from a 15 story building. from what height in feet was the ball dropped?

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)