You have to put 1,2,3,4,5,6 in every row and column (NO REPEATS!), but also so you get the number in each box using +,-,x or divide. Example: top left it says 11+. The box has two spaces, so you need two numbers that add up to 11. So the only option is 5 and 6. But you don't know which way round yet, so you must look at some other boxes first.

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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