exam Maths Puzzle Numerical Ability

x+7>-10

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exam Other Question

Find the inverse of f(x) = 3x + 1 where f: R->R. once again i had to write in the simplest form without negative exponents. my probelm was 10^-3 and i got 1/(over) 10^3 = 1/(over) 100 is this right??