Solve the problem.How many 4-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, if repetitions are not allowed?
A. 23
B. 24
C. 2401
D. 840
Answer: D
Mathematics
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Solve the problem.Solve for a: 
A. a = 1
B. a = 
C. a = 
D. a = 
Mathematics
Prepare a probability distribution for the experiment. Let x represent the random variable, and let P represent the probability.Two marbles are drawn from a bag in which there are 4 red marble and 2 blue marble. The number of blue marbles is counted.
A. 
B. 
C. 
D. 
Mathematics
Subtract. Use borrowing, if necessary.
A. 331 B. 355 C. 5355 D. 351
Mathematics
Graph the equation. Identify the coordinates of the vertex.y = x2 + 4x - 7
A. (4, 0)
B. 
C. (-2, -11)
D. (-2, 3)
Mathematics