In each group of four products, one is wrong. Use estimation to determine which product is incorrect.
A. 64 × 247 = 15,808
B. 216 × 43 = 9288
C. 440 × 99 = 43,560
D. 277 × 56 = 15,523
Answer: D
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Find the area.Find the area of the region between the curve x = e13t , y = 
e-12t and the x-axis, 0 ? t ? ln 9.
A. 13 B. 8 C. 12 D. 9
Find the indicted product and simplify if possible.Measurements concerning the volume of liquid flowing through a valve result in the expression 
A. 3F5 + 9F3 - 4F2 + 4F - 16 B. 3F6 - 3F4 + 12F3 - 4F2 + 4F - 16 C. 3F5 - 3F4 + 12F3 - 4F2 - 4F - 16 D. 3F5 - 3F4 + 12F3 - 4F2 + 4F - 16
Add.
A. 54 B. 44 C. 55 D. 53
Solve the problem.The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). The linear model for this data is 
where x is the cost of advertising (in thousands of dollars) and y is number of products sold (in thousands). Use this model to predict the number of products sold (in thousands) if the cost of advertising is $8000. 
A. 22,375,800 products sold B. 84,820 products sold C. 78,120 products sold D. 75,120 products sold