exam Maths Puzzle Numerical Ability

hope someone could help

(-i)^4 "i" is an imaginary number
What is the correct solution?

1. i
2. -i
3. 1
4. -1

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exam Other Question

1. Four buttons have diameters of 5/8, 3/4, 9/16, and 7/8 inches. Which button is smallest?

3. What is the perimeter of a rectangle if the length is 7/10 in. and the width is 10/x^2-2x + 4/x = 5/x-2