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1. When $x thousand is spent on advertising a product, the sales (number of units sold)...

1. When $x thousand is spent on advertising a product, the sales (number of units sold) is given by S(x)= -x^3+9x^2+21x+100 for 0<=x<=10. Which of the following is not correct? Optional Answers:

1. Sales has a global (absolute) minimum at x=0

2. Sales has a global (absolute) maximum at x=7

3. Rate of sales has a global (absolute) maximum at x=3

4. Rate of sales has a global (absolute) minimum at x=0

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