Answer
$\int_C (x+3y^2) dy = 1010$
Work Step by Step
$x = 2t, y = 10t , dx = 2dt$
$\int (x+3y^2)dy\\
= \int_0^1 (2t+300t^2).10dt\\
=[10t^2+1000t^3]_0^1 = 1010$
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