Solve the logarithmic equation. Be sure to reject any value that is not in the domain of the original logarithmic expressions. Give the exact answer.log x + log (x +1) = log 72

A.
B. {9, -8}
C. {9}
D. {8}


Answer: D

Mathematics

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Use L'Hospital's rule to find the limit.

A. 1
B. 0
C. ?
D.

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Solve the problem.The graphs below show the first and second derivatives of a function y = f(x). Select a possible graph of f that passes through the point P.f'?f"?

A.

[NOTE: Graph vertical scales may vary from graph to graph.]
B.

[NOTE: Graph vertical scales may vary from graph to graph.]
C.

[NOTE: Graph vertical scales may vary from graph to graph.]
D.

[NOTE: Graph vertical scales may vary from graph to graph.]

Mathematics

Solve the problem.Suppose a manufacturer finds that the cost y of producing x units is given by a formula of the form   If it costs $1300 to produce 20 units and $1750 to produce 35 units, what is the fixed cost?

A. $450 B. $700 C. $2050 D. $30 E. none of these

Mathematics

Provide an appropriate response.Explain the error in the following: 10x2 - 90 = (x + 3)(x - 3)

What will be an ideal response?

Mathematics