Add or subtract and simplify.(3 + 9i) - (-7 + i)
A. 10 - 8i
B. 10 + 8i
C. -4 + 10i
D. -10 - 8i
Answer: B
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Solve the problem.Suppose f(x) = 31.2 + 1.3 log(x + 1) models salinity of ocean water to depths of 
at a certain latitude. x is the depth in meters and f(x) is the salinity in grams of salt per kilogram of seawater (expressed as parts per thousand or ppt). Approximate the salinity, to the nearest hundredth, when the depth is 346 meters.
A. 77.96 ppt B. 80.56 ppt C. -27.90 ppt D. 34.50 ppt
Provide an appropriate response.A carpenter can install seven doors in five hours. How long will it take him to install 12 doors? Round to the nearest hundredth hour.
Fill in the blank(s) with the appropriate word(s).
Solve the problem.Suppose that a radio signal transmission pattern can be modeled by 
for 
where the units are in miles. Describe the influence of k on the pattern. Assume that the positive x-axis points east.
A. With increasing k, the distance of transmission becomes smaller in the east and west directions. B. With increasing k, the transmission becomes more strongly directed toward the north and less strongly directed to the east. C. With increasing k, the transmission becomes more strongly directed toward the east and less strongly directed to the west. D. With increasing k, the distance of transmission becomes greater in the east and west directions.
Write each fraction as an equivalent fraction with the LCD of the two fractions as the denominator.
, 
and 
A. 
; 
; 
B. 
; 
; 
C. 
; 
; 
D. 
; 
; 