Sports Illustrated planned to ask a random sample of Division I college athletes, "Do you believe performance-enhancing drugs are a problem in college sports?" How many athletes must be interviewed to estimate the proportion concerned about use of drugs within ±2% with 90% confidence?

Write a recursive sequence that represents the sequence defined by the following explicit formula:

What properties allow transformation to be used as a problem solving tool

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).