Indicate whether the function is one-to-one.{(12, -18), (-12, -18), (20, -8)}
A. Yes
B. No
Answer: B
Mathematics
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Find the exact value of the expression.cos 
sin 
- cos 
sin 
A. 
B. 
C. 
D. 1
Mathematics
Solve the problem.The weekly sales in thousands of items of a product has a seasonal sales record approximated by 
(t is time in weeks with 
referring to the first week in the year). During which week(s) will the sales equal 91,950 items?
A. week 4, week 20, and week 52 B. week 30 and week 47 C. week 21 and week 30 D. week 4 and week 47
Mathematics
Find the midpoint of the segment PQ.P(-8, -5, 4), Q(-3, -1, 1)
A. 
B. 
C. 
D. 
Mathematics
Solve the system. x - y + 5z = 16-3x + 3y - 15z = 3 x + 4y + z = 7
A. (0, 1, 3) B. (3, 0, 1) C. (3, 1, 0) D. No solution
Mathematics