Write the sum in summation notation.3 + 6 + 9 + 12 + 15
A. 
B. 
C. 
D. 
Answer: D
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Use conversion factors to convert the units of measure.0.4 gallons to ounces
A. 4.8 oz. B. 51.2 oz. C. 25.6 oz. D. 12.8 oz.
Write the best-fit linear model for the data.The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). Find a linear function that approximates the number of products sold as a function of the cost of advertising. 
A. y = 55.8 - 2.79x B. y = -26.4 - 1.42x C. y = 26.4 + 1.42x D. y = 55.8 + 2.79x
Find the exact value of the indicated trigonometric function of ?.sin ? = - 
, tan ? > 0Find sec ?.
A. 
B. - 
C. - 
D. - 
Find the area of the triangle. If necessary, round the answer to two decimal places.A = 23°, b = 9, 
A. 3.52 B. 3.53 C. 3.50 D. 3.51