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

If f(x)= x^2 + 5, find f(a + h) - f(a).
I haved tried to work this problem and the answer I got was 2ah + h^2 + 10, but it is not correct. Cofee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture?