Question 21: 24 minutes

x = 
x = 24
Question 22: 20 centimeters
x = one side of the square
x² = 25
x = 5
4x = perimeter
4(5) = perimeter
20 = perimeter
Question 23: 17 sides
Hexagon = 6 sides
Octagon = 8 sides
Triangle = 3 sides
Total amount of sides = 6 + 8 + 3
Total amount of sides = 17
If you are asking how many times 48 goes into 4896 it is 102
4896÷48= 102
hopefully it helps ;)
The answer to that is 18. Since your power is just 1, it is itself.