book Maths Puzzle Numerical Ability

5-3[4-(5 + 2)] - 9

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book Other Question

Determine whether g(x)=3x-6 and f(x)=1/3x+2 are inverse functions.

Thank you One spring stretches 6in when a 32-lb weight is hanging on it and a 9in when a 48-lb weight.Find the slope of the line that models the stretch(s)of this spring depending on weight,