What is 55 over 5 as a mixed number

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

What is the total area of the figure?

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.