How does this equation y=asin(bx+c) relates to f(x)=asin( 2pi/p x)?

Mexico city, mexico, is the world's second largest metropolis and is also one of its fastest-growing cities with a projected growth rate of 3.2% per year. its population in 1991 was 20,899,000 people. use the formula p = 20.899e0.032t to predict its population p in millions with t equal to the number of years after 1991. what is the predicted population to the nearest thousand of mexico city for the year 2010?

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?