Prove that if (a, b) and (c, d) are two distinct points, the line joining them is perpendicular to the line joining (b, c) and (d, a)

What is the rotational symmetry of a wheel

The diameter of a ball is 8 in. what is the volume of the ball? use 3.14 for pi. enter your answer as a decimal in the box. round only your final answer to the nearest hundredth.

Neveah and clint are baking muffins for the bake sale. they need to bake 30 muffins for their display case. clint has baked 4 so far, and neveah has baked 7. how many muffins (m) do they have left to bake? show your work!