Simplify the expression.
+ 
A. 2 sec 2 x
B. csc 2 x
C. 2 csc 2 x
D. 2 csc x
Answer: C
Mathematics
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Solve the system of equations using elimination. 
A. (-2, 6) B. infinitely many solutions C. (6, -2) D. no solution
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Decide whether the given set of numbers is a commutative group under the given operation.Prime numbers; multiplication
A. Yes B. No
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Factor out the GCF.6s7t2 + 2s5t3
A. 2s5t2(3s2 + t) B. 2s2t(3s + t) C. 2s7t3(3s2 + t) D. s5t2(6s + 2t)
Mathematics
Simplify the expression. Assume all variables represent positive real numbers.(
+ 3)(
+ 5)
A. 
+ 5
+ 3
+ 15
B. 
+ 8
+ 15
C. 9
+ 15
D. 
+ 15
Mathematics