Solve the equation.
= 7
A. 49
B. 
C. 7
D. 
Answer: C
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Write the expression in the standard form a + bi.i18
A. -i B. -1 C. i D. 1
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
Find the equation in standard form of the parabola described.Vertex at (0, 0); Directrix the line x = 16
A. x2 = -64y B. y2 = -16x C. y2 = 64x D. y2 = -64x
Solve the problem.Ken is 6 feet tall and is walking away from a streetlight. The streetlight has its light bulb 14 feet above the ground, and Ken is walking at the rate of 4.1 feet per second. Find a function, d(t), which gives the distance Ken is from the streetlight in terms of time. Find a function, 
, which gives the length of Ken's shadow in terms of d. Then find 
. What is the meaning of 
?
A. (S ? d)(t) gives the time in terms of Ken's distance from the streetlight. B. (S ? d)(t) gives the length of Ken's shadow in terms of his distance from the streetlight. C. (S ? d)(t) gives the length of Ken's shadow in terms of time. D. (S ? d)(t) gives the distance Ken is from the streetlight in terms of time.