Simplify.
A. 
B. 6
C. 2
D. 2
Answer: D
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Express the vector as a product of its length and direction.-9i + 9j + 9k
A. 9( -i + j + k)
B. 
C. 9
D. 9
Solve.The distance to the horizon varies directly as the square root of the height above ground level of the observer. If a person can see 6 miles from a height of 25 feet, how far can a person see from a height of 121 feet?
A. 14.4 miles B. 13.2 miles C. 12.1 miles D. 13.5 miles
Solve the problem. Round to the nearest cent.Tech Support offers trade discounts of 10/20 and terms of 3/10, n/30 on its tool cases. Assuming a service department earns the cash discount, find the net cost of a tool case list-priced at $529.
A. $369.45 B. $380.88 C. $342.79 D. $359.19
Solve the problem.Which of the lines in the picture are lines of symmetry of the given figure?
A. Only m B. l and m C. l, m, and n D. Only l