Can someone tell me if these are functions or not..

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?

Evaluate the expression. (9 + 5)(3 + 2)0

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.