Astudy of fish is being conducted in a pond. they marked 30 fish and released them. the next day, they counted 75 fish, 25 of them which had been marked. find the best estimate of fish population in he pond.

Find parametric equations for the line. (enter your answers as a comma-separated list of equations. let x, y, and z be functions of t.) the line in the direction of the vector 5 i + 5 j − 6k and through the point (−4, 4, −2).

Bring the fraction a/a-4 to a denominator of 16-a^2

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.