Kieran subscribes to a text messaging service on his cell phone. his monthly bill for the service is given by the equation b = 0.25t, where b is the bill amount and t is the number of texts.

the constant of proportionality in terms of cost per text is

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?