Solve the problem.Suppose the cost per ton, y, to build an oil platform of x thousand tons is approximated by y = 
. What is the cost for x = 400?
A. $200,000.00
B. $47,619.05
C. $31.25
D. $119.05
Answer: B
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Solve the problem.Find the missing length in the following right triangle. If necessary, round to the nearest tenth. 
A. 21.1 cm B. 222.5 cm C. 445 cm D. 14.5 cm
Write the expression as a complex number in the form a + bi.
+ 
A. 0 - 15i B. 0 + 15i C. 0 + 56i D. -15 + 0i
Solve the problem.A bookcase is to be constructed as shown in the figure below. The height of the bookcase is 4 feet longer than the length of a shelf. If 26 feet of lumber are available for the entire unit (including the shelves, but NOT the back of the bookcase), what values are possible for the length of a shelf?
A. length ? 3 feet B. length ? 4.5 feet C. length ? 11.0 feet D. length ? 3 feet
Find the length of the latus rectum of the parabola.Focus: (0, 3); Directrix y = -3.
A. 6
B. 
C. 24
D. 12