The first four terms of a sequence are shown below. 18, 25, 32, 39,...
Which explicit expression can be used to find the nth term of the sequence?
A. 18 + 7n
B. 18 + 7(n-1)
C. 7 + 18n
D. 7 + 18 (n-1)

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?

A50% increase followed by 33 1/2% decrease

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.