Determine if the representation below is an example of a proportional or non-proportional relationship. A pool fills at a rate of 540 gallons per hour.

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?

How to do this , and can some one explain

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'