Answer: Circle.
Depending on the angle and the place of intersection, when a plane intersects a cube, the sections created may be a square, a pentagon, a trapezoid, a triangle or a rectangle (even you can obtain an octagon), but you will never get a circle.
Let the second number be x.
First number = x - 8
Third number = 3x
Sum of the numbers = 117
x - 8 + x + 3x = 117
5x = 125
x = 25
Thus,
The first number is 17. The second number is 25. The third number is 75.
Answer:
5. an increase and then decrease; the spike in visitors could be because of the start of summer
6. December is around Christmas, where most people would have holiday
7. (I'm not sure)