Did the old version of the instrument triangle have a different sound because of the open corner and different triangle shape of isosceles triangle, instead of the equilateral triangle shape used today?

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

Consider 6x2 + 6x + 1. which term immediately tells you that this expression is not a perfect square trinomial? justify your answer

What is an alternate exterior angle