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). Find the equation of the least-squares regression line that models the data
A. y ? 55.8 - 2.79x
B. y ? 26.4 + 1.42x
C. y ? -26.4 - 1.42x
D. y ? 55.8 + 2.79x
Answer: D
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Replace the polar equation with an equivalent Cartesian equation.r = -12 csc ?
A. y = -12 B. x = -12 C. -12y = 1 D. -12x = 1
In a school survey, students showed these preferences for instructional materials. Answer the question.
About how many students would you expect to prefer computers in a school of 700 students?
A. About 140 students B. About 36 students C. About 126 students D. About 252 students
Combine the complex numbers.(6 + 4i) - (-4 + i)
A. -10 - 3i B. 2 + 5i C. 10 + 3i D. 10 - 3i
Solve: (-4 + j2)/(6 + j3)
a. 2 12 Ä + jÄÄ 5 5 b. 2 12 -Ä + jÄÄ 5 5 c. 2 12 Ä - jÄÄ 5 5 d. 12 -jÄÄ 5 e. 2 8 -Ä + jÄÄ 5 15