Decide which of the 5 properties of a commutative group (closure, identity, inverse, associative, commutative) hold for the given system.
A. Closure, identity, associative, and commutative only
B. Closure, identity, inverse, and commutative only
C. All of them
D. Closure, identity, inverse, and associative only
Answer: C
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Choose the graph that represents the given function without using a graphing utility.f(x) = 
A. 
B. 
C. 
D. 
Solve the problem.The profit made when t units are sold, t > 0, is given by P(t) = t2 - 20t + 91. Determine the number of units to be sold in order for 
(a profit is made).
A. 7 < t < 13 B. t = 7 or t = 13 C. 0 < t < 7 or t > 13 D. t = 20
Rationalize the denominator. Assume variables represent non-negative values.
A. 7
B. 
C. 
D. 7
Solve the problem.The sales of a mature product (one which has passed its peak) will decline by the function S(t)= S0e-at, where t is time in years. Find the sales after 16 years if 
and 
A. 98,675 products B. 2,062,820 products C. 1952 products D. 3903 products