Write the expression in the standard form a + bi.
A. 
- 
i
B. 
+ 
i
C. 
+ 
i
D. 
- 
i
Answer: D
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Find the exact value of the expression without using a calculator.
A. 
B. 
C. 
D. 
According to industry sources, online banking is expected to take off in the near future. The projected number of households (in millions) using this service is given in the following table:
Year, x012345Households, y4.57.510.013.015.618.0?
(Here, 
corresponds to the beginning of 1997.)Find an equation of the least-squares line for these data. Please round the coefficients in your equation to three decimal places. Use the result to estimate the number of households using online banking at the beginning of 2004, assuming the projection is accurate. Round the answer to three decimal places.
?
A. 
million
B. 
million
C. 
million
D. 
million
Convert the capacity as indicated.12 quarts to gallons
A. 48 gal B. 6 gal C. 24 gal D. 3 gal
Simplify 
if 
.
?
A. 
B. 
C. 
D. 
E. x