Find the midpoint of points A(8,-7) and B(3,-1) graphically

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite

Yesterday, george drank 1 small bottle and 2 large bottles, for a total of 1,372 grams. the day before , he drank 1 small bottle and 1 large bottle, for the total of 858 grams. how many grams does each bottle hold?