Question

{x:x=2y+5;y ∈N and 2≤y<6

Answer 1

Values of y satisfying the given condition are 2, 3, 4, 5

Corresponding values of x are 2(2) + 5,2(3) + 5,2(4) + 5,2(5) + 5 = 9, 11, 13, 15.

Hence, elements of the set 9,11,13,15.

∴ Total number of elements in the set are 4

Answer 2

see in given attachment...