Which of the following represents "two times the sum of a number and fifteen is equal to six times the number"?

a. 2n+15= 6n
b. 2(6n + 15) = n
c. 2(n + 15) = 6n

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

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

Which statement accurately explains whether a reflection over the y axis and a 270° counterclockwise rotation would map figure acb onto itself?