Megan owes $26.00 for her text messaging in the month of august. if her text messaging plan costs $9 for the first 650 messages and 10cents for each additional text message, how many text messages did she send that month?

Question

anonymous · Answer

Wait ill start over. You have the function:
$$f(x)=\left\{\eqalign{
&9.00\phantom{.};\phantom{.}x\leq650\
&0.10x-56.00\phantom{.};\phantom{.}x\gt650\
}\right.$$
So we know that $f(x)=$26.00$ so we are dealing with the second condition. Let us find out this answer:
$$\eqalign{
&f(x)=0.10x-56.00 \
&26.00=0.10x-56.00 \
&82.00=0.10x \
&820=x \
}$$
Therefore, she sent 820 texts