Replace the Cartesian equation with an equivalent polar equation. (x - 20)2 + (y + 3)2 = 400
A. r2 = 40r sin ? - 6r cos ? - 9
B. r2 = 40r cos ? - 6r sin ? - 9
C. r = 40 cos ? - 6 sin ? - 9
D. r2 = -20r cos ? + 3r sin ? + 400
Answer: B
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Solve the problem.A researcher finds a positive correlation between the amount of coffee people drink and anxiety level. Can you conclude that drinking coffee causes anxiety? Propose other explanations for the correlation. Suggest some ways that the researcher could go about establishing causality. Refer to the six guidelines for establishing causality.
What will be an ideal response?
Let U = {all soda pops}; A = {all diet soda pops}; 
and 
Describe the given set in words.A' ? C
A. All diet soda pops and all soda pops in cans B. All non-diet soda pops in cans C. All diet soda pops in cans D. All non-diet soda pops and all soda pops in cans
Write the Chinese numeral as a Hindu-Arabic numeral.
A. 20 B. 2000 C. 26 D. 200
Tell whether the angle is acute, right, obtuse, straight, or reflex.
A. Straight B. Acute C. Right D. Zero