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Price of the dining set = $785
Sales Tax = 7% of $785
Sales Tax = 0.07 x 785
Sales Tax = $54.95
Total price = $785 + $54.95 = $839.95
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Answer: The cost to purchase the dining set is $839.95.
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Answer: A. Shortages of fresh water
Cos(x) is infinitely differentiable, can be expanded using Taylor's series.
The series about c can be expressed as

Substituting cos(x), c= π /4,we have

and since




we can simplify the expansion to

Note that the sign pattern is - - + + - - + + - - ..... following the sign pattern of the derivatives of cos(x).