exam Maths Puzzle Numerical Ability

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)=

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exam Other Question

Please help me solve this problem. simplify: 6/radical 5+2 After a sailboat has been on the water for 3h, a change in the wind direction reduced the average speed of the boat by 5mph. The entire distance sailed was 57mi. The total time spent sailing was 6h. How far did the sailboat travel the in the first 3 h?