exam Maths Puzzle Numerical Ability

How do you solve this problem?

(SQUARE ROOT 2)^7

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exam Other Question

Solve the following systems. Write answers as an ordered pair.

y-x =5

x+y = -1
A = (a + b)5 over h

A = 300
b = 30
h = 2

300 = (a + 30)5 over 2

Need help on how to simplify to find what a =