Decide which of the 5 properties of a commutative group (closure, identity, inverse, associative, commutative) hold for the given system.
A. None of them
B. Closure, identity, inverse, and associative only
C. Closure, identity, associative, and commutative only
D. Closure only
Answer: A
Mathematics
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Provide an appropriate response.The diagonals of a 
intersect at their common midpoint.
A. trapezoid B. pentagon C. parallelogram D. rhombus
Mathematics
Find A if B = 20° and ? + ? = 120°.
?
?
Remember: The sum of the three angles in any triangle is always 180°.
?
A. A = 60° B. A = 50° C. A = 70° D. A = 100° E. A = 40°
Mathematics
Solve the equation.4x + 5 = 0
A. - 
B. - 
C. 
D. 
Mathematics
Evaluate the exponential expression.(-1)5
A. -1 B. -5 C. 5 D. 1
Mathematics