A man buys six books from the store and a preferred reader discount card for $20. Later that day, he goes and buys five more boo
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To solve this problem you must apply the proccedure shown below:
1. When you plot the given points, you obtain a trapezoid, therefore, you must apply the formula for calculate the area of a trapezoid, which is:
Where is the larger base,
is the smaller base and
is the height.
2. The dimensions are:
3. Substitute values:
The answer is: