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 
class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_43d6bcb2465d4f27aafa1e1f5" />. Round your answer to two decimal places.
?
A. 
B. 
C. 
D. 
E. 
Answer: A
Mathematics
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Use the vertical line test to determine whether the graph represents a function.
A. not a function B. function
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Find the slope of the line.
A. 0 B. -3 C. 3 D. undefined
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Perform the indicated operations and simplify the result. Leave the answer in factored form.
+ 
A. 
B. 
C. 
D. 
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