How do u write 2.7 in words

Which expression shows the sum of the polynomials with like terms grouped together

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

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.