Evaluate the expression by first changing the form. Verify the answer by use of a calculator. 
A. 
B. 
C. 2
D. 
Answer: B
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Solve the problem.Find the center of mass of the region of constant density bounded by the paraboloid 
and the xy-plane.
A. 
= 0, 
= 0, 
= 27
B. 
= 0, 
= 0, 
= 3
C. 
= 0, 
= 0, 
= 
D. 
= 0, 
= 0, 
= 
Solve the problem.A square flower bed is to be enlarged by adding 3 meters on each side. If the larger square has an area of 169 square meters, what is the length of a side of the original square?
A. 7 m B. 16 m C. 19 m D. 10 m
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
Factor the difference of squares.49rs2 - 36rt4
A. r(7s + 6t2)(7s - 6t2) B. r(7s + 6t2)2 C. (7rs - 6rt2)2 D. (49rs + rt2)(s - 36t2)