Solve.How many different three-digit numbers can be written using digits from the set {4, 5, 6, 7, 8} without any repeating digits?

A. 10
B. 120
C. 60
D. 20


Answer: C

Mathematics

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Factor using the formula for the sum or difference of two cubes.27x3 + 64

A. (3x + 4)(9x2 + 16) B. (3x + 4)(9x2 + 12x + 16) C. (3x - 4)(9x2 + 12x + 16) D. (3x + 4)(9x2 - 12x + 16)

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Based on the graph, find the range of y = f(x). 

A. (-10, 10) B. (-?, ?) C. (-?, 0) or {0} or (0, ?) D. (-?, 0) or (0, ?)

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Solve the problem.A water tank can be filled in 7 minutes and emptied in 8 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?

A.  min
B.  min
C.  min
D. 56 min

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