Complete the square and write the equation in standard form. Then give the center and radius of the circle.x2 + y2 - 6x + 6y + 7 = 0
A. (x - 3)2 +(y + 3)2 = 11
(-3, 3), r = 
B. (x - 3)2 +(y + 3)2 = 11
(3, -3), r = 11
C. (x - 3)2 +(y + 3)2 = 11
(3, -3), r = 
D. (x + 3)2 +(y - 3)2 = 11
(-3, 3), r = 
Answer: C
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Approximate the natural logarithm with a scientific calculator. Round to four decimal places.ln 0.00056
A. -3.2518 B. -7.4876 C. 3.2518 D. 7.4876
Find the given limit by evaluating the derivative of a suitable function at an appropriate point.
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Fill in the blank(s) with the appropriate word(s).
Graph the equation by plotting points.y = x3 
A. 
B. 
C. 
D. 
The amount of nitrogen dioxide, a brown gas that impairs breathing, present in the atmosphere on a certain May day in a city has been approximated by
?
?
where A(t) is measured in pollutant standard index (PSI), and ?t is measured in hours, with 
corresponding to 4 a.m. Use the trapezoidal rule with 
to estimate the average PSI between 4 a.m. and noon. Please round the answer to the nearest hundredth. (Hint: 
.)
?
A. 106.95 nitrogen dioxides
B. 108.79 nitrogen dioxides
C. 159.77 nitrogen dioxides
D. 102.79 nitrogen dioxides
E. 129.7 nitrogen dioxides