Subtract.
A. 36,443
B. 32,443
C. 32,357
D. 32,437
Answer: B
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Add or subtract, if possible. Assume that all variables represent non-negative values. Simplify your answer. 8 
- 3xy 
A. 2x2y2
B. 5xy3
C. 5x2y3
D. 2 xy2
Solve the system of four equations in four unknowns using matrices. w + 3x + y - 2z = -10-3w - x + 3y + z = 5 2w + 3x - y + 3z = 7 -w + x + y - 3z = -7
A. (1, -6, 0, 4) B. (-4, 1, -3, 3) C. (-1, -3, 6, 4) D. (-3, 0, 4, 1)
Evaluate.9.481
A. 9.48 B. 0 C. 1 D. 89.87
The combination of cold temperatures and wind speed determine what is called wind chill. The wind chill is a temperature that is the still-air equivalent of the combination of cold and wind. When the wind speed is 25 mph, the wind chill WC depends on the temperature t (in degrees Fahrenheit) according to 
. For what temperatures does it feel at least 25°F colder than the air temperature? That is, find t such that 
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?
A. 
B. 
C. 
D. 
E. 