La altura de un triángulo equilátero cuyo perimetro mide 45 cm ?

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

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

Astraight water slide is 175 feet above ground and is 200 feet long. what is the angle of depression to the bottom of the slide?