exam Maths Puzzle Numerical Ability

If f(x)=4x-3. Find the following f(-1)

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exam Other Question

Solve log(2) (7x-3)>or=log(2) (x+12).

Thank you Kevin works 3 times as many hours in a week as Karen does. If each were to work 6h more per week, Kevin would be working twice as many hours as Karen does. How many hours does each work now?