exam Maths Puzzle Numerical Ability

If k(r)=7-4r, find k(1+h)-k(1)
___________
h

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please help with factoring the following: d+2/6 - d-4/15= Two investments are made totaling $16,000. For a certain year, these investments yield $970 in simple interest. Part of the $16,000 is invested at 5% and the rest at 7%. How much is invested at 7%?