Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 576t. after how many seconds does the projectile take to reach its maximum height? show your work for full credit.

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.