(a food ball team has four chances with the ball keep going to try to make a touchdown. a team gained 7 yards, lost 2, gained 4,and lost 1(. how many total yards the teams move forward and backwards

Answer! if you don’t mind, can you explain

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.