Write interval notation for the graph.
A. (2, ?)
B. (-?, 2]
C. [2, ?)
D. (-?, 2)
Answer: A
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Find the center of mass of the wire that lies along the curve r and has density ?.r(t) = (6 cos 3t)i +(6 sin 3t) j + 18tk, 0 ? t ? 2?; ?(x, y, z) = 1(1 + sin 3t cos 3t)
A. 
B. 
C. 
D. 
Find the sum of the series as a function of x.
A. - 
B. - 
C. 
D. 
Solve the problem.A stockbroker sold 50 shares of stock for $27.14 each. What was the total amount of the sale?
A. $1357.10 B. $1356.90 C. $1357.00 D. $1357.11
Let x represent one number and let y represent the other number. Use the given conditions to write a system of nonlinear equations. Solve the system and find the numbers.The difference between the squares of two numbers is 7. Twice the square of the second number subtracted from the square of the first number is 
. Find the numbers.
A. 4 and 3; -4 and -3 B. 4 and 3; -4 and 3; 4 and -3 C. 4 and 3 D. 4 and 3; -4 and 3; 4 and -3; -4 and -3