Which relation is not a function? A) Input: name of student; Output: GPA Eliminate B) Input: price of an item; Output: UPC code C) Input: name of student; Output: birth month D) Input: next door neighbors; Output: zip code

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is: