Agrid with 3 rows and 52 columns is tiled with 78 identical 2x1 dominoes. how many ways can this be done such that exactly two of the dominoes are vertical?
any idea?

With #! i’ve tried to figure it out but i can’t.

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

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