15% of the apples in a crate are rotten there are 12 rotten apples in the crate how many apples are in the crate

Determine the relationship of ab and cd given the following points

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2

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).