7. Consider the operation a * b = a + b – ab on the set S = Z. a) Is this operation commutative? Justify your answer. b) Is this operation associative? Justify your answer. %3D

A value meal package at Ron's Subs consists of a drink, a sandwich, and a bag of chips. There are 4 types of drinks to choose from, 4 types of sandwiches, and 3 types of chips. How many different value meal packages are possible? Answer How to enter your answer (opens in new window) Keypad Keyboard Shortcuts Tables Submit Answer D Nov 13 9:06 0

Which of the following phrases describes an empty set? O Common factors of 5 and 9. Multiples of 2 less than 10 that are divisible by 5. Prime numbers divisible by 2. Perfect squares less than 10 that is divisible by 3.

Determine whether the statement below is true or false. If it is false, rewrite it as a true statement. The number of different ordered arrangements of n distinct objects is n!. Choose the correct answer below. O A. The statement is true. O B. The statement is false. A true statement is, "The number of different unordered arrangements of n distinct objects is n!." O C. The statement is false. A true statement is, "The number of different ordered arrangements of n distinct objects is n." O D. The statement is false. A true statement is, "The number of different ordered arrangements of n distinct objects is (n- 1)!."