Since he can type 35 words per minute, it means that any given minute, he will type 35 times the number of minutes there. For example, if he types for two minutes he will have types 70 words. We can use this to write an expression where m is the amount of minutes. The expression will be 35m and in function form (where f(m) is amount of words typed):
[tex]f(m) = 35m[/tex]
