exam Maths Puzzle Numerical Ability

Please help to simplify

4i^7 - the square root of -5 * the square root of -5 + the square root of 7 * the square root of -7 - the square root of -16

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exam Other Question

A plane takes 6 hours to fly from San Francisco to New York, and 5 hours to return back. The wind velocity is 50 miles per hour, from New York to San Francisco. What is the speed of the airplane. when there is a question like 34 over 5a = how do i work that out?