The price of an item has been reduced by 55%. The original price was $35. What's the price of the item now ?
2 answers:
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You can try the points and see which satisfy the relation. I find it easier to consult a graph of the solution set and the offered points.
The appropriate choice is ...
... C: (1, 0) . . . . . . . on the boundary of the solution set.
The answer must be 
since the triangular pyramid has 4 faces and each has an area of 30 
we should multiply that by 4 , so :
