Which of the following relations shows a function?

A.{ (5, - 7), (6, - 7), (-8, - 1), (0, - 1) }

B.{ (4, - 1), (4, - 2), (3, - 1), (2, 4) }

C.{ (4, 5), (3, - 2), (-2, 5), (4, 7) }

D.{ (1, 4), (4, 1), (1, - 4), (-4, 1) }

Factor the polynomial completetly 21b2-40b-21

Corrine has a $30 cell phone plan that includes 200 minutes for phone calls and unlimited texting. An additional fee is charged for using than 200 minutes for phone calls. When Corrine uses 300 minutes her monthly rate increases to $80

A dog is tied to a 10 centimeter diameter pole, with a 7 meter long leash. if the dog runs around the pole until his collar is tight to the pole, how many degrees has the dog run around the pole?

The vertices of a triangle are listed below. K (-2, 2), L (2, 2), M (0, - 3) What is the area of the triangle?

1. 75 mi/hr into m/s

Maria normally spends half an hour driving to work. When her average speed is ten miles per hour slower than usual, the trip takes ten minutes longer. How many miles does she drive to work?

Which counterexample shows that the conjecture All mammals are monkeys is false

Witch of these two polygons has a larger interior angle triangal or heptagon

The equation y = 12.21x + 37.42 fits the scatterplot of the values for stock ABC over the past month with an r-value of 0.9871. How much do you think ABC will be worth at x = 62 days? A. $794.44 B. $781.52 C. $12.21 D. $37.42

sally went to a clearance rack at the department store and found a shirt that she wanted to buy. the shirt was $36.00 and it was on sell for $ 24.00. what is the percent decrease