If a, b, c, and d are coplanar lines and a ∥ b, b ⊥ c, and c ∥ d, then which statement must be true? d ⊥ a

d ⊥ c

c ∥ a

d ∥ b

Two lines parallel to the same plane are parallel to eachother

Find the root(s) of f (x) = (x- 6)2(x + 2)2.

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi, r^3 , where r is the sphere’s radius.