I need help with this calculus question. Thanks!

012 (part 1 of 4) 10.0 points A point is moving along the graph of y = tanr dr so that = 2.4 cm/s. dt dy a) Find when : = dt Answer in units of cm/s. 013 (part 2 of 4) 10.0 points dy b) Find when r = dt Answer in units of cm/s. 014 (part 3 of 4) 10.0 points dy c) Find dt when I = -0.94. Answer in units of cm/s. 015 (part 4 of 4) 10.0 points d) Find dy when r = 0.84. dt Answer in units of cm/s