For the pair of supply and demand equations
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and 
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where x represents the quantity demanded in units of a thousand and p the unit price in dollars, find the equilibrium quantity and the equilibrium price.
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A. x = 4.50, p = $55.50
B. x = 9.50, p = $210.50
C. x = 9.50, p = $150.50
D. x = 7.00, p = $103.00
E. x = 2.50, p = $77.50
Answer: E
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For the given data value, find the standard score and the percentile.A data value 2.5 standard deviations above the mean.
A. z = 0.25; percentile = 59.87 B. z = -2.5; percentile = 0.62 C. z = 2.5; percentile = 1.95 D. z = 2.5; percentile = 99.38
Perform the indicated operations and write the result in standard form.
A. 7 + i
B. -7 - i
C. -7 - i
D. -7 + i
Factor completely. If the polynomial is prime, state so.x2 + 18x + 81
A. (x + 9)(x - 9) B. (x - 9)2 C. prime D. (x + 9)2