-3\sqrt(8x^(2))*7\sqrt(3x^(3))
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The correct answer is 7 9/14, I have provided my work shown below
Plot the points you found in part (b) on a suitable set of coordinates and draw a line through them. It might help your accuracy to use the y-intercept of 20 also.
Only 5 glasses because:
÷ 
= 5 