1.995 x 10 to the negative power of 23?

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?