Consider U = {x|x is a real number}.
A = {x|x ∈ U and x + 2 > 10}
B = {x|x ∈ U and 2x > 10}
Which pair of statements is true?
a. 5 ∉ A; 5 ∈ B
b. 6 ∈ A; 6 ∉ B
c. 8 ∉ A; 8 ∈ B
d. 9 ∈ A; 9 ∉ B