Evaluate if possible.
+ 
A. 12
B. 130
C. 
D. 14
Answer: D
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Solve the problem.The parabola z = 5x2 in the xz-plane is revolved about the z-axis. Write the equation of the resulting surface in cylindrical coordinates.
A. r = 5z B. z = 5r2 C. r2 = 5z2 D. z = 5r
Solve the system. If there is an unlimited number of solutions, find one of them.3x + 2y + z = 42x - 3y - z = 55x + 12y + 5z = 2
A. x = -4, y = 5, z = -2
B. x = 4, y = 5, z = 2
C. Unlimited: x = 
, y = 
, z = 0
D. Inconsistent
Provide an appropriate response. A small office manager wants to buy new cordless phones for each of the office's 11 desks. Each phone costs $89.99. Estimate the total cost by using numbers with one nonzero digit. Find the exact amount.
A. $900; $898.98 B. $900; $989.89 C. $800; $989.89 D. $800; $989.99
Solve the problem.Eloise contracts to work for 10 days, receiving 
the first day, 
the second day, 
the third day, and so on, with each day's pay triple that of the previous day. How much will she earn on the last day of the contract?
A. $590.49 B. $196.83 C. $15.36 D. $1771.47