Sara planted string beans in two pots. Plant A is 4 inches tall and it grows 2/3 of an inch per day.
Plant B is 9 inches tall and it grows 1/2 of an inch per day.
Write rules for each piant. y = total height and x = days

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?