Use the formula to evaluate the series 3 - 9 + 27 - 81 + . . - a8in the formula for a finite series a1 is the first term r is the common ratio and n is the number of terms. a. -19,680b. -9840c. -4920

Using graph paper, determine the line described by the given point and slope. click to show the correct graph below.(0, 0) and 2/3

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.

What makes a trapezoid an isosceles trapezoid?