exam Maths Puzzle Numerical Ability

Given f(x)= -5x -1, find f(a-1).

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exam Other Question

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 Write the function you would graph to find the solution of each one-variable equation.
1.3x-8=0

2.7=1/2x+4

3.-x+5=9