exam Maths Puzzle Numerical Ability

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?

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wHAT IS THE LINEAR EQUATION ANSWER FOR 7x+2y=o, and I have to graph it by corridinate like
x y
0,0
1,1
2,2 and it have to make a straghit line thanks u Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 54 pounds of feed worth $.28 per pound by mixing one kind worth $.24 per pound with another worth $.42 per pound. How many pounds of the cheaper kind should they use in the mix?