Select the correct answer. Write the letter on a separate sheet of paper. a 1. Which of the following is a well-defined sct? a. A set of good writers b. A set of factors of 3. c. A set of honest students in grade seven d. A set small numbers 2. Which of the following is the symbol of a null set? b. n c. S a. U d. 3. Michelle listed the set of all letters in the word "serendipity" as shown below. What is wrong with this set? A = {s, e, r, e, n, d, i, p, i, t, y a. It uses commas. b. It uses braces. c. The objects in this set are not listed once. d. A capital letter is used to represent this set. 4. Given the set of letters in the word "LOVE". What is the cardinality of the given set? a. 11 b. 8 c. 6 d. 4 5. What is the cardinality of 10, 20, 30, ..., 80/? a. 8. b. 10 c. 12 d. 14 6. If a car has 3 gallons of gas in the tank and you add 8 more, how much is in the tank? A. -11 B.5 C. 11 D. 24 7. Find the difference of 82 and -41. A. -123 B. -41 C. 41 D. 123 8. What is the difference between -57 and -35? A. -92 B.-22 C. 22 D. 92 9. There is a wooden board 24 inches long and 8 inches is cut off, how many inches of board do you have left? A. -16 B.3 C. 16 D. 32 10. Find the product of -21 and -3. A.-63 B.-24 C.-7 D. 63​