exam Maths Puzzle Numerical Ability

Helen Weller invested $15,000 in an account that pays 12% simple interest. How much additional money must be invested in an account that pays 15% simple interest so that the averag

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Determine an equation in the form y=mx+b of a line satisfying the given condition:
throught the points (5,-1) and (3,0) Given f(x)= -5x -1, find f(a-1).