Solve the problem.How many different three-digit numbers can be written using digits from the set {1, 2, 3, 4, 5} without any repeating digits?
A. 60
B. 20
C. 120
D. 10
Answer: A
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Find the extreme values of the function and where they occur.y = x3 - 3x2 + 1
A. Local maximum at (0, 1), local minimum at (2, -3). B. Local minimum at (2, -3). C. Local maximum at (0, 1). D. None
Find the requested term in the sequence.The nth term in 15, 30, 45, 60, 75, . . .
A. 15n + 2 B. 15n C. 15n + 15 D. 15n - 15
Add or subtract as indicated. Simplify, if necessary.- 
+ 
A. 0
B. 1
C. -1
D. 
Solve the problem.Consider the following simplified digital photograph that has a 3 × 3 grid with four gray levels numbered from 0 to 3. It shows a letter Y in black on a light gray background.
Let A be the 3 × 3 matrix that represents this figure digitally. Find the matrix which represents the entire picture becoming one shade lighter.
A. 
B. 
C. 
D. 