∵ a correct answer + a good explanation will guarantee you a :) (This is from AMC 10 so if you answer it, Congrats! Ur rlly smart and everyone knows it :)

For how many integral values of n are the numbers 2n, 3n and 10 - n the lengths of the sides of an obtuse triangle?

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c,with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

Evaluate cos2θ for cosθ = square root of 3/2