Solve the equation in the real number system.x4 - 21x2 - 100 = 0
A. {-2, 2}
B. {-10, 10}
C. {-5, -2, 2, 5}
D. {-5, 5}
Answer: D
Mathematics
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Find the limit of the sequence or determine that the limit does not exist.an = 
A. 0 B. 1 C. does not exist D. e20
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Convert the Indo-Arabic numeral to the indicated form.72,302; Mayan
A. 
B. 
C. 
D. 
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Find the exact value of the expression.tan 345°
A. 
B. 2 + 
C. -2 - 
D. 
Mathematics
Translate the problem to a system of equations, then solve using Cramer's Rule.Jerry has 3 pieces of string. The total length is 82 inches. The sum of the two longer pieces is 70. The middle piece is twice as long as the shortest piece. What are the lengths of the 3 pieces?
A. 6, 12, and 64 inches B. 12, 24, and 46 inches C. 12, 46, and 56 inches D. No solution
Mathematics