exam Maths Puzzle Numerical Ability

evaluate if a=-3 b=3/4 and c= -1/2
c^2 - 2b -5a

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Can you help me solve my word problem...instructions...the cost in dollars of manufacturing (w)wing nuts is given by the xpression 0.07w + 13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut? What is the slope of the line of best fit? use the point (1991, 230) amd (1997, 350)