exam Maths Puzzle Numerical Ability

Please keep me solve this problem:
2(x+2)^0

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exam Other Question

find the inverse of the one-to-one function f(x)=(3sqrtx-6)

a)f^1(x)=x^3+6
b)f^1(x)=x+6
c)f^1(x)=1/x^3+6
d)f^1(x)=x^3+36 two planes left an airport at noon. one flew east at a certain speed and the other flew west at twice the speed. the planes were 2700 mi apart in 3 h. how fast was each plane flying?