exam Maths Puzzle Numerical Ability

Give the 9th term in the sequence 2, -6, 18, -54?

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The rate at which a tablet of vitamin C begins to dissolve depends on the surface area of the tablet. One brand of tablet is 1 centimeters long and is in the shape of a cylinder wi 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?