Sean los siguientes vectores: A=-3 i + -1 j

B=3 i + 2 j

Halle el ángulo que forman utilizando la siguiente ecuación :A⃗ ∙B⃗ =ABcosθ. (Sugerencia: Calcule el producto punto, luego calcule la magnitud de cada vector y, por último, utilice la operación del Arco coseno para hallar el ángulo)

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Which of the following disjunctions is true? 4 + 4 = 16 or 6 - 5 = 11 4 · 3 = 7 or 3 - 2 = 5 8 - 5 = 13 or 7 · 2 = 12 7 - 4 = 11 or 6 + 3 = 9

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14