Question 20 (2 points) )Listen A function converts number grades {{x c Z|0 A, 80 B, 70 D, and 0 F This function is: both one-to-one and onto only one-to-one neither one-to-one nor onto only onto Question 21 (2 points) ) Listen The function y = x with domain and co-domain all real numbers is both one-to- one and onto. FS FOQuestion 21 (2 points) Listen The function y = with domain and co-domain all real numbers is both one-to- one and onto. True False Question 22 (2 points) ) Listen The relation defined on the set of integers as: x Ry x and y have the same remainder when divided by the integer a is an equivalence relation. True False Question 23 (2 points) ) Listen FA FS FG F7 X 4Question 23 (2 points) Listen The relationa R b a is divisible by b is defined on the set of integers. Which statement is false? OR is reflexive. R is symmetric. OR is transitive. Question 24 (2 points) Listen Supposex E A - B where A and B are sets. Which of the following is FALSE? Ox& Ac OxEB - A FS (X]Question 26 (2 points) Listen How many elements are there in the power set of {a, b, c, d, e, f, g}? Write the number. A/ Question 27 (2 points) Listen The sets {x ER x 2 0} and {x ER|x