the only 2 possible answers are 2 and -2 .But the answer is y=2 because x is positive
has no antiderivative in terms of elementary functions (polynomials, exponentials, logarithms, trigonometric functions, etc), but there is a special function defined to fit that role called the error function, 
, where
By the fundamental theorem of calculus, we can see that
which means we have
The answer is D.
y = x + 1 = 4 + 1 = 5
y = 1/2x + 3 = 1/2(4) + 3 = 2 + 3 =5
