exam Maths Puzzle Numerical Ability

I really need help with this stuff I get so confused.
Given f(x)=-4x-4, find f(2)

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exam Other Question

Please help with this word problem. Thanks

If An annuity has a record of 9.58% annual growth compounded annually. How long will it take to double your money in this fund? Can you think of a real life situation where a straight-line graph might be applicable and why you think it might be true? Think about a real life situation that follows a linear