Hi everyone. I ran into a minor problem while trying to solve a problem on line integral. I suspect this question to be very straight-forward as it gave the parametric equations of the curve C. However, I am still unable to get the answer for some reason. May I have someone to point out where I went wrong? Thanks! Question: Ah, the image didn't get uploaded.. Please refer to the attached image. Thanks! The question in question is Q1(a). My attempt: Since x = t2 + 1 and y = t3+t , we have x(t) and y(t). Following on, I went one to apply the formula, ∫ F⋅ dr = ∫ f(x(t), y(t))||r'(t)|| dt. I had r(t) as (t2 + 1) i + (t3+t) j. And I have r'(t) = (2t) i + (3t2 + 1) j, and ||r'(t)|| = √ (9t2 + 1)(t2 + 1). Since the range of t is 0 ≤ t ≤ 1, I integrated over this range and my calculator returned 3.73 as the answer, but the answer in my answer key wrote 6. May I know where I had gone wrong? Thanks! :D <In case the picture cannot be seen, I have uploaded it here.> Thanks again!