Solve the problem.Michael's bank contains only nickels, dimes, and quarters. There are 63 coins in all, valued at $5.50. The number of nickels is 5 short of being three times the sum of the number of dimes and quarters together. How many dimes are in the bank?
A. 46
B. 10
C. 7
D. 12
Answer: C
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At what points is the given function continuous?f(x, y) = 
A. All (x, y) B. All (x, y) such that 3x + 6y ? 0 C. All (x, y) such that x + y ? 0 D. All (x, y) such that 3x + 6y ? 0
Use counting rules to determine the probability.Dave puts a collection of 15 books on a bookshelf in a random order. Among the books are 2 fiction and 13 nonfiction books. What is the probability that the 2 fiction books will be all together on the left side of the shelf and the 13 nonfiction all together on the right side of the shelf?
A. 0.01619 B. 0.01809 C. 0.01333 D. 0.00952
Use the formula for 
to evaluate the expression.
A. 792
B. 3,991,680
C. 
D. 95,040
Solve the problem.The gravitational attraction A between two masses varies inversely with the square of the distance between them. If the force of attraction is 9 lb when the masses are 2 ft apart, what is the attraction when the masses are 6 ft apart?
A. 3 lb B. 2 lb C. 4 lb D. 1 lb