Solve the problem. Round your answer, if appropriate.As the zoom lens in a camera moves in and out, the size of the rectangular image changes. Assume that the current image is 6 cm × 5 cm. Find the rate at which the area of the image is changing (dA/df) if the length of the image is changing at 0.8 cm/s and the width of the image is changing at 0.1 cm/s.
A. 10.6 cm2/sec
B. 9.2 cm2/sec
C. 5.3 cm2/sec
D. 4.6 cm2/sec
Answer: D
Mathematics
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Solve the problem.Every hour, the population of a certain country increases by about 6192. If this country's death rate is 2037 deaths per hour, what is this country's (hourly) birth rate?
A. 5074 births per hour B. 7731 births per hour C. 8229 births per hour D. 4155 births per hour
Mathematics
Write a numerical expression for the phrase and simplify it.
more than the sum of - 
and 
A. 
+ 
; 
B. 
+ 
; 
C. 
+ 
; - 
D. 
+ 
; 
Mathematics
Perform the division.
A. 2x2 + 3 B. x2 + 2x - 3 C. 2x2 - 2x + 3 D. x2 - 2x + 3
Mathematics
Use a polar coordinate system to plot the point with the given polar coordinates.(-2, -135°)
A. 
B. 
C. 
D. 
Mathematics