Find the equation of the sphere of radius 5 that lies above the xy-plane that just touches the xy-plane at the point (4, −6, 0)

If 90° < θ < 180° and cotθ = -1/3, then cscθ =

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm