What will be the next figure?

To determine the next figure in the sequence, observe the pattern of shapes changing from left to right:
The pattern shows that the first shape progresses from a triangle (3 sides) to a square (4 sides) to a pentagon (5 sides). The next logical shape in the sequence should have 6 sides, which is a hexagon. The circle remains constant in each figure.
Thus, the next figure should contain a hexagon and a circle. The correct answer corresponds to this logic:

Which figure should replace the question mark (?) if the following series were to be continued?

Which figure should replace the question mark (?) if the following series were to be continued?

If x means ÷, ÷ means -, - means +, and + means x, what will be the value of the given expression?
7 + 5 ÷ 3 − 12 × 4
Choose the option which completes the given figure series.

Select the correct option that will fill in the blank and complete the series.
18, 36, 108, 432, 2160, .............Select the correct option that will fill in the blank and complete the series.
52, 56, 65, 81, 106, ?Select the correct option that will fill in the blank and complete the series. 21, 43, 85, 171, 341, .......
Select the correct option that will fill in the blank and complete the series.
3, 5, 7, 9, 11, ?
2, 2, 2, 2, 2, ?