Part two of finding angle and arc measures

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

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).