I In Problems 814, decide (without calculation) whether the integrals are positive, negative, or zero. Let D be the region inside the unit circle centered at the origin, let R be the right half of D, and let B be the bottom half of D. 8.f1dA D 9. Positive 9. The function being integrated is x, y) = 5x. Since x > 0 in R, f is positive in R and thus the integral is positive