59. a rectangular flower bed has a width of (2x + 5) and a length of (x + 10).
a. write a polynomial that represents the area of the flower bed.
b. find the area of the flower bed when the length is 25 feet.

The notation n(C) translates to "the number of items in set C". So all that you do is count the number of values in the set {3,5} which happens to be two items.

Some books use absolute value notation to indicate the number of items. So some books may write |C| instead of n(C). This concept is known as set cardinality (or the cardinal value of a set).

Step-by-step explanation:

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