In which direction does the parabola y = -x? open?

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3