For the next four questions you will be given information about a linear transformation 7 : R - R with rank(7) = r and dim null(T) = n. Decide if T is one-to-one, onto, both, or neither. Question 20 a = 5, b = 3, r = 3 One-to-one O Onto O One-to-one and onto Neither Question 21 a = 5, b = 4, n = 1 One-to-one O Onto One-to-one and onto Neither Question 22 a = 3, b = 3, n = 0 One-to-one O Onto One-to-one and onto Neither