exam Maths Puzzle Numerical Ability

For the polynomial function y= f(x) the graph of x^3 -2.5x^2 - 1.4375x + 2.0625 for which values k = 0, 1, 2, or 3 will the equation f(x) = k have complex roots?

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exam Other Question

I need helping to solve using row operations on each system:
x+yz-3z=1
2x-y+z=9
3x+y-4z=8 Business and finance. The cost in dollars of manufacturing w wing nuts is given by
the expression 0.07w + 13.3. Find the cost when 375 wing nuts are made. What is
the average cost to manufacture one wing nut?

Thanks