Find the domain of the function of two variables.f(x, y) = 
A. {(x, y)| x2 + y2 ? 7}
B. {(x, y)| x2 - y2 ? 7}
C. {(x, y)| x2 + y2 ? 7}
D. {(x, y)|x2 - y2 ? 7}
Answer: A
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Write true or false for the following statement.Let A = {3, 5, 7, 9, 11, 13} B = {3, 5, 9, 11} C = {5, 9, 13}Every element of C is also an element of A.
A. True B. False
The position vector of a particle is r(t). Find the requested vector.The velocity at t = 
for r(t) = 4sec2(t)i - 10tan(t)j + 6t2k
A. v
= 16i - 20j + 3?k
B. v
= 16i + 20j - 3?k
C. v
= -20j - 3?k
D. v
= -20j + 3?k
Graph the integrand and use geometry to evaluate the integral.
A. 40 B. 10 C. 20 D. 80
Solve the problem.Best Office Machines spent $46,130 this year on health insurance alone. If total sales were $467,900, what percent of total sales was spent on health insurance? Round to the nearest tenth of a percent, if necessary.
A. 9.9% B. 10.1% C. 101% D. 1%