Solve.How many different three-number "combinations" are possible on a combination lock having 21 numbers on its dial?
A. 3990
B. 7560
C. 15,120
D. 7980
Answer: D
Mathematics
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Round the number as indicated.578 to the nearest hundred
A. 590 B. 700 C. 500 D. 600
Mathematics
Tell whether the statement is true or false.Let A = {2, 3, 4, 5, 6, 7}, B = {4, 6, 8}, C = {2, 3, 5, 7}, D = {2, 7}, and 
C ? A
A. True B. False
Mathematics
Find the trigonometric function value for the angle shown.cot ?
A. cot ? = - 
B. cot ? = 
C. cot ? = 
D. cot ? = 
Mathematics
Determine whether number is rational or irrational.- 
A. Rational B. Irrational
Mathematics