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1) Let f(x)=−x^3−12x^2−45x+2 a) Find the open interval(s) where the following function is concave upward or...

1) Let f(x)=−x^3−12x^2−45x+2

a) Find the open interval(s) where the following function is concave upward or concave downward.

b)Find any inflection point(s).

c) Find absolute maximum and minimum values on [-5,5].

2) A fence must be built to enclose a rectangular area of 20,000 square feet. Fencing material costs $ 2.50 per foot for the two sides facing north and south and $3.20 per foot for the other two sides. Find the cost of the least expensive fence.

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