Find the product of the complex number and its conjugate.3 + 
i
A. 9 + 3i
B. 18
C. 12
D. 6
Answer: C
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A preschool charges $14 for a child to attend its morning session or $7 to attend the afternoon session. No child can attend both. 40 children are enrolled in the preschool. If the daily receipts are $420, how many children attend the morning session?
A. 18 B. 16 C. 36 D. 23 E. 20
Find the sum of the sequence.
A. 272 B. 53 C. 400 D. 384
Solve the problem.The price of Enrico's plane ticket is $661. Enrico's father will pay 50% of the cost. How much will Enrico's father pay?
A. $330.50 B. $343.50 C. $350.50 D. $33,050
Solve the problem.An artifact is discovered at a certain site. If it has 57% of the carbon-14 it originally contained, what is the approximate age of the artifact to the nearest year? (carbon-14 decays at the rate of 0.0125% annually.)
A. 3440 years B. 4497 years C. 1953 years D. 4560 years