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
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Use L'Hospital's rule to find the limit.
A. 1
B. 0
C. ?
D. 
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.]
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
Provide an appropriate response.Explain the error in the following: 10x2 - 90 = (x + 3)(x - 3)
What will be an ideal response?