given data:
Makis phone plan costs 17.50 per month plus $0.15 per text message.
to find: the maximum number of text messages Maki can use so the phone bill is no more than $56.50
[tex]56.50-17.50=39[/tex]$ 39 is left for text messages.
[tex]\frac{39}{0.15}=260[/tex]Thus, Maiks can send 260 text messages per billing period.
