exam Maths Puzzle Numerical Ability

Decide whether or not the functions are inverses of each other.
f(x)=(x-4)^2, x≥4; g(x)= sqrt(x+4)

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exam Other Question

solve the equation by finding square roots.
2x^2 = 14 two scales used for measuring temprature are kelvin scale and the celsius scale. A temperature in degrees kelvin is about 273 degrees greater than a temperature in degrees celsius.