30. Which of the following relations is not a function?
A. {(5, 5), (6, 6), (7, 7), (8, 8)}
B. {(-3, 1), (-4, 1), (-5, 1), (-6, 1)}
C. {(4,-5), (4,7), (4,1),(4, -1)}
D. {(0, 0), (4, 5), (5,0), (3, 4)}

You can find the constant of proportionality by finding the ratio of

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?