Find the probability.A lottery game contains 21 balls numbered 1 through 21. What is the probability of choosing a ball numbered 22?
A. 0
B. 
C. 1
D. 21
Answer: A
Mathematics
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Find the acute angle, in degrees, between the lines.y = 
x + 10 and y = - 
x - 18
A. 30° B. 45° C. 60° D. 75°
Mathematics
Use divisibility tests to decide whether the first number is divisible by the second. 648,542; 9
A. Yes B. No
Mathematics
Solve the problem.A square sheet of paper measures 45 centimeters on each side. What is the length of the diagonal of this paper?
A. 4050 cm
B. 90 cm
C. 45
cm
D. 45 cm
Mathematics
Solve the problem.If cos ? = - 
, and 
< ? < ?, then find tan 2?.
A. 
B. 
C. 
D. 
Mathematics