### Home > CCA2 > Chapter 7 > Lesson 7.1.4 > Problem 7-70

7-70.

While working on their homework on sequences, Davis was suddenly stumped!

“*This problem doesn’t make sense!*” he exclaimed. Tess was working on her homework as well.

"*What's the problem?*” she asked.

"*This problem is about a SEQUENCE, t(n) = 9n − 2 , but it is asking whether or not it is a function. How can a sequence be a function?*”

“*Well of course a sequence is a function!*” said Tess.

Who is right? Should Davis be confused, or is Tess correct? What is the difference between a sequence and a function? Explain completely. Homework Help ✎

Does the sequence have any *x*-values for which there is more than one *y*-value?