An inferior product with a large advertising budget does well when it is introduced, but sales decline as people discontinue use of the product. Suppose that the rate of weekly sales revenue is given by  , where S is the sales in thousands of dollars and t is the time in weeks. Find the function that describes the weekly sales revenue if

align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_006de392c0a444fdbaaaa689f" /> thousand dollars when .

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A.
B.
C.
D.
E.

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Answer: A

Mathematics

Evaluate the function.Find f(3, 0, 7) when f(x, y, z) = 3x2 + 3y2 - z2.

A. 76 B. -15 C. -40 D. -22

Solve the problem.A person invests $6000 at 9% interest compounded annually. Let f(t) represent the value (in thousands of dollars) of the account at t years after the $6000 is deposited.i) Find an equation for f.ii) What will the value be in 8 years?iii) What is the coefficient a in your model f(t) = abt? What does it mean in terms of the account?

What will be an ideal response?

Solve.A multiple birth is any birth with 2 or more children born. The birth rate is the number of births per 1000 women. In one country, the birth rate B of multiple births as a function of age a is given by the function  for  What are the independent and dependent variables?

A. The independent variable is birth rate; the dependent variable is multiple birth rate B. The independent variable is age, a; the dependent variable is multiple birth rate, B C. The independent variable is multiple birth rate, B; the dependent variable is age, a D. The independent variable is age, a; the dependent variable is the number of children born

Evaluate the expression for the given values.c2 - 3ab, if a = -3, b = 3, and c = 6

A. 63 B. -15 C. -9 D. 39