is the relation {(1, 3), (-4, 0), (3, 1), (0,4), (2, 3)} a function? why or why not?
answers:
a)yes, the range value 3 corresponds to two domain values, 1 and 2.
b)yes, there is no value in the domain that corresponds to more than one value of the range.
c)no, the range value 3 corresponds to two domain values, 1 and 2.
d)no, there is no value in the domain that corresponds to more than one value of the range.

Acarpool service has 2,000 daily riders. a one-way ticket costs $5.00. the service estimates that for each $1.00 increase to the one-way fare, 100 passengers will find other means of transportation. let x represent the number of $1.00 increases in ticket price. choose the inequality to represent the values of x that would allow the carpool service to have revenue of at least $12,000. then, use the inequality to select all the correct statements. the maximum profit the company can make is $4,125.00. the maximum profit the company can make is $15,625.00. the price of a one-way ticket that will maximize revenue is $12.50. the price of a one-way ticket that will maximize revenue is $7.50.