exam Maths Puzzle Numerical Ability

Please help me solve this problem. simplify: 6/radical 5+2

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One day the temperature at 1 AM was 44 degrees F, and by 4 pm the temperature was 59 degrees F. What was the hourly rate of temperature change? the questions are from a hand out

1. Find the inverse of f(x)=3x+1 where f:R arrow R

2. If f(x) = x-3 g(x)=2x+5 find fog and gof

3. If f(x) = x^2 + 3x-5 then f(-2)=