Can you help me with this?

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

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?

Asphere has a diameter of 10 in. what is the volume of the sphere?