You plug in $67 for y because you need to find out what week you'll have $67 dollars in the account.
I'm pretty sure the answer will be 6/10
Hope this helps, best of luck, terribly sorry if I'm wrong if I am my apologies
~Animaljamissofab ♥
Answer:

The opposite of subtraction is addition, so you would have to add 4 to both sides:


So the problem ask on which of the following choices you had is the points should the banner be attached in the archway and the best answer among the choices will be letter C. (1.5, 4.87) and (3.5, 4.37). I hope this will help you and feel free to ask for more.
So then n=number of long distance calls, then add the flat rate
long distance cost=number of calls times cost per clll or n times 0.42 or 0.42n
the flat rate is 24
so total is c so
c=24+0.42n