It's a linear function.
y = 2x + 4 - it's a slope-intercept form
slope m = 2
y-intercept = 4
The slope m = 2 > 0, thereofre the function is increasing (going to infinity).
Calculate the value of function for x = 3:
y = 2(3) + 4 = 6 + 4 = 10.
Therefore we have answer:
Range is (10, ∞).