The length of the base of a triangle is 6.6 cm and its height is 4.9 cm. if the area of the triangle is half of the product of its base length and height, the area of the triangle is cm2.

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?