Find unit tangent vector given

r(t)= <7t, 5cost, 5sint>​

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota

Aline has a slope of . which ordered pairs could be points on a parallel line? check all that apply. (-8, 8) and (2, 2) (-5, -1) and (0, 2) (-3, 6) and (6, -9) (-2, 1) and (3,-2) (0, 2) and (5,5)