PLeAsE hElP ASAP I NEVER LeArNeD THIS STUF

Acircle has a circumference of 2 pi cm. which statement about the circumference and area is true? a comparison of the area and circumference is not possible since the area cannot be determined. the numerical values of the circumference and area of the circle are equal. the numerical value of the circumference is greater than the numerical value of the area. the numerical value of the circumference is less than the numerical value of the area.

For what values of x is x2 + 2x = 24 true?

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.