Find the product.(5x + 2y)2
A. 25x2 + 4y2
B. 5x2 + 20xy + 4y2
C. 5x2 + 4y2
D. 25x2 + 20xy + 4y2
Answer: D
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Solve the equation.
x = 9
A. {27} B. {3} C. {12} D. {11}
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. Use differentials to estimate the decrease in the number of housing starts when the mortgage rate is increased from 17% to 17.8%. Round to the nearest unit.
?
Give your answer as a number without the units.
Fill in the blank(s) with the appropriate word(s).
Evaluate to four decimal places using a calculator.e1.1
A. 2.9901 B. 3.3201 C. 0.0953 D. 3.0042
Use the given data points to construct a linear model, then use the model to find the appropriate Celsius or Fahrenheit temperature.
Choose any two data points and use them to construct a linear equation that models the data, with x being Celsius and y Fahrenheit. Then use the equation to find the Fahrenheit temperature corresponding to 130° Celsius.
A. y = 
x + 32; 266° Fahrenheit
B. y = 
x + 32; 90° Fahrenheit
C. y = 
x + 32; 54° Fahrenheit
D. y = 
x + 32; 176° Fahrenheit