A study prepared for the National Association of Realtors estimates that the number of housing starts per year over the next 5 yr will be 
million units, where r (percent) is the mortgage rate.
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Use differentials to estimate the decrease in the number of housing starts when the mortgage rate is increased from 17% to 17.2%. Round to the nearest unit.
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A. 12,567 housing starts
B. 12,819 housing starts
C. 12,362 housing starts
D. 11,956 housing starts
Answer: B
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A roast is baking in the oven. The internal temperature R, in degrees Fahrenheit, of the roast t minutes after it is put in the oven is given by
.
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The roast should be removed from the oven when its internal temperature is between 160 and 165 degrees. During what time period should the roast be removed? Round your answer to two decimal places.
A. Between 116.88 and 119.53 minutes after it is placed in the oven B. Between 102.07 and 105.07 minutes after it is placed in the oven C. Between 102.41 and 108.52 minutes after it is placed in the oven D. Between 107.20 and 112.12 minutes after it is placed in the oven
Factor the sum or difference of two cubes.8 - x3
A. (2 + x)(4 - 2x + x2) B. (2 + x)(4 - x2) C. (2 - x)(4 + 2x + x2) D. (2 - x)(4 + x2)
Sketch the graph of the function.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Use the method of adding y-coordinates to graph the function.y = 4 cos x + cos 2x
A. 
B. 
C. 
D. 