please specify the answer thank you.

6. Make an educated guess as to the most common syntax error in Lisp programs.

7. Lisp began as a pure functional language but gradually acquired more and more imperative features. Why?

14. What are the arguments both for and against the idea of a typeless language?

18. Languages continually evolve. What sort of restrictions do you think are appropriate for changes in programming languages? Compare your answers with the evolution of Fortran.