Question

A = {xeN|4≤x≤7} B = {yen|y=x+2,xeA} C= {zen|z=2x,xea}​

Answer 1

A = { x € N |4 ≤ x ≤ 7 } :

A =  { 4, 5, 6, 7 }

B = { y € N | y=x+2, x€A } :

B=  { 6, 7, 8, 9 }

C = { z € N | z=2x, x€A} :

C= { 8, 10, 12, 14 }.