9. which relation represents a function? a. {(−1, 3), (0, −1), (1, 3), (2, 5)} b. {(1, −1), (−1, 0), (1, 1), (3, 2)} c. {(5, −1), (3, −1), (4, 1), (5, 2)} d. {(−4, 2), (1, −2), (0, 0), (1, 1)}

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Laura read 1/8 of a comic book in 2 days. she reads the same number of pages every day. what part of the book does she read in a week

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?