If f(x)=-1/3, what is the value of f(-3)

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What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?