It costs $100 to rent the bowling alley, plus $4 per person. The cost for any number (n) of people can be found using the expres
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In the figure, we can consider that the base is the side that mesures 12 in and that the height is the side that measures 15 in, since that sides are perpendicular. So, we just need to use the given formula:
Hence, the area of the triangle is 90 in² (B).