exam Maths Puzzle Numerical Ability

PLease help to simplify

-3i^4 + 5i^3

DIVIDED BY

6i^2 - 7i

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exam Other Question

factor the following polynomials as completely as possible

(((x^3+8)))
How many distinguishable permutations of letters are possible in the word BASEBALL?
The answer is supposed to be 5040.