Define f: r → r by the rule f(x) = 4x – 1. a) prove that f(x) is one-to-one. (3 marks) b) prove that f(x) is onto. (3 marks)

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.