un terreno rectangular mide el doble de largo que de ancho. Si el largo aumenta 40 m y el ancho, 6 m, el área de duplica. ¿Cuáles son las dimensiones del terreno original?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)