Evaluate the line integral c f · dr, where c is given by the vector function r(t). f(x, y, z) = (x + y)i + (y − z)j + z2k r(t) = t2 i + t3 j + t2 k, 0 ≤ t ≤ 1

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?