The demand equation for a certain brand of metal alloy audiocassette tape is 
, where x represents the number (in thousands) of ten-packs demanded each week when the unit price is $p.
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How fast is the quantity demanded increasing when the unit price/ten-pack is $20 and the selling price is dropping at the rate of $.11/ten-pack/week? Round your answer to the nearest integer.
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Hint: To find the value of x when p = 20, solve the equation 
for x when p = 20.
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A. Increasing at the rate of 93 ten packs/wk.
B. Increasing at the rate of 82 ten packs/wk.
C. Increasing at the rate of 66 ten packs/wk.
D. Increasing at the rate of 31 ten packs/wk.
Answer: C
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What will be an ideal response?
Graph the function on the indicated interval.y = 
, 0 ? x ? 4 
A. 
B. 
C. 
D. 
Express the number in scientific notation.0.000315
A. 3.15 × 10-3 B. 3.15 × 104 C. 3.15 × 10-4 D. 3.15 × 10-5
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A. The discriminant value is -24. B. The discriminant value is 56. C. The discriminant value is 24i. D. The discriminant value is 48.