What is 100 for $10.00 as a rate

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).

Sections of prefabricated woods are each 5 1/3 feet long, how long are 7 1/2 sections placed end to end?

Does 9q + 7 also equal 7 + 9q ? (simplifying algebraic expressions)