Perform the indicated operation. Write the result in the form a + bi.
? 
A. 
B. -i
C. -
D. i
Answer: C
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Using the derivative of f(x) given below, determine the intervals on which f(x) is increasing or decreasing.f'(x) = (1 - x)(9 - x)
A. Decreasing on (-?, 1) ? (9, ?); increasing on (1, 9) B. Decreasing on (-?, -1) ? (-9, ?); increasing on (-1, -9) C. Decreasing on (1, 9); increasing on (-?, 1) ? (9, ?) D. Decreasing on (-?, 1); increasing on (9, ?)
Solve.A nuclear cooling tower cross section is a hyperbola having a diameter of 50 ft at the center. The distance between the two foci is 96 ft. What is the equation for the hyperbola?
A. 
- 
= 5
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
How many license plates can be made using 3 different letters followed by 4 different digits if the first digit cannot be 0 and the letter O is not used? ?
A. 136,080,000 B. 204,120,000 C. 62,596,800 D. 43,817,760 E. none of the above
Solve using a system of three linear equations.A deli sells three sizes of chicken sandwiches: the small chicken sandwich contains 4 ounces of meat and sells for $2.50; the regular chicken sandwich contains 9 ounces of meat and sells for $3.00; and the large chicken sandwich contains 12 ounces of meat and sells for $3.50. A customer requests a selection of each size for a reception. She and the manager agree on a combination of 50 sandwiches made from 25 pounds 8 ounces of chicken for a total cost of $147. How many of each size sandwich will be in this combination? (Note: 1 pound = 16 ounces)
A. 18 small sandwiches, 22 medium sandwiches, 10 large sandwiches. B. 20 small sandwiches, 16 medium sandwiches, 14 large sandwiches. C. 16 small sandwiches, 12 medium sandwiches, 22 large sandwiches. D. 22 small sandwiches, 10 medium sandwiches, 18 large sandwiches.