The volume v(t) of air (in cubic inches) in an adult's
lungs t seconds after exhaling is approximately
find the maximum and minimum amount of air in the lungs, how
often the person exhales, and how many breaths per minute the
person takes.

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?

Can someone check if i did this correct. it’s number 4 if you’re wondering.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).