exam Maths Puzzle Numerical Ability

I need some help with finding the value of the following: I will need to type out the words cuz computers dont have the signs used,

1.exponent3 square root -64
2.exponent4 suare root 27
3.4+suare root 7 divided by 7

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exam Other Question
an airplane flies 1449 miles against the wind and 1539 miles with the wind in a total time of 5hours. the speed of the airplane in still air is 600mph. what is the speed of the wind ? 6a-(b-a)-b-(a-b)