Please answer all questions and show work so I can understand.

20) For which of the following values of 0 is the slope of the 0 0 = -1/4 circle r = 4 equal to 1? 0 0=1 O 0 = 1/2 and 0 = 3x /2 O 0 = -1/4 and 0 = 3x /4 21) Eliminate the parameter to describe the O The path is a parabola of equation y = 2x- - 4x - 1. path of a bug in the plane for : O The path is a parabola of equation y = 2x- + 7. c =t - 1 andy =2t2 - 4t + 1 O The path is a parabola of equation y = 2x- +8x - 1. for 0