72,-36,18,-9 find the common ratio​

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.

Hurry im being timed the graph of f(x)=x^3-3x^2+4 is shown based on the graph how many distinct real numbers solutions does the equation x^3-3x^2+4=0 have

Use the second shift theorem to find the inverse laplace transform of (e^−3s) / (s^2 + 2s − 3)