Acell phone company charges $45 per month for unlimited calls and $0.25 per text messages. another call phone company $0.15 per text messegaes and $70 per month for unlimited calls. write and solve an equation to evaluate the time the cost from both companies will be the same

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18