Simplify the expression. Assume that all variables are positive when they appear.
A. 3x2y
B. 9x2y
C. 63xy
D. 3x4y2
Answer: A
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Add or subtract by first simplifying each radical and then combining any like radical terms. Assume that all variables represent positive real numbers.
+ 
A. -2
B. 10
C. 10
D. 70
Solve the problem.The number of DVDs (in thousands) sold by a leading retailer has been decreasing due to the introduction of online streaming services.
Let S be the number (in thousands) of DVDs sold t years since the year 2013. A model of the situation is 
Predict the number of DVDs that will be sold in the year 2020.
A. 1000 B. 10 C. 100 D. 10,000
Without graphing, determine whether the graph of the quadratic function opens up or opens down.f(x) = x2 - 8
A. opens up B. opens down
Solve the problem, using 3.14 for ?. Round to nearest tenth unless instructed differently.Find the area of the circular racetrack.(Use 3.14 for ?. Round to the nearest foot.) r = 80 ft R = 105 ft
A. 7850 ft2 B. 14,523 ft2 C. 34,619 ft2 D. 20,096 ft2