Solve the proportion (someone pls help)

What is the range of this function? all real numbers such that y ≤ 40 all real numbers such that y ≥ 0 all real numbers such that 0 ≤ y ≤ 40 all real numbers such that 37.75 ≤ y ≤ 40

Is a positive integer raised to a negative power always positive

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).