Answer:
9
Step-by-step explanation:
If she buys 10 CDs, it would come out to one hundred. if she bought 9 she would still have enough to pay for shipping
I think c but I'm not sure
Answer: I'm not entirely sure, but maybe 1/x^2?
Area: ½ × base × height
Perimeter: sum of side lengths of the triangle
of vertices: 3
Number of edges: 3
Internal angle: 60° (for equilateral)
Sum of interior angles: 180°
