Aflight instructor charges $50 per lesson, plus an
additional fee for the use of his plane. the charge for
the use of the plane varies directly with the square root
of the time the plane is used. if a lesson plus 16 minutes
of plane usage costs $90, what is the total amount
charged for a lesson having 36 minutes of plane usage?

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).