HELP PLS ASAP 50 POINTS HELP ILL MARK BRAINLIEST

If 25% of y is 30, what is 60% of y?

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).

If f(x)=3 over x+2 - square root x-3 then f(7)=