Suppose Set A contains 70 elements and the total number elements in either Set A or Set B is 76. If the Sets A and B have 21 elements in common, how many elements are contained in set B?

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem

Angle that produces maximum distance

Can someone me with this? i’m not sure what to put for my equations.