A and T are points. On their own, they cannot define a line. So we can rule out choice A
WCR and TRA are angles. For any triple the points do not fall on the same straight line. So we cannot define any lines here. This crosses off choice B
Choice C is the answer because WC does define a line. We only need two points to form a line. Similarly CR does the same job. We draw a line marker with two arrows at each end to be placed over the letters to indicate "line". 
Choice D is similar to choice D; however, it is not the answer because WT is the same line as WC. In other words, WC = WT. We haven't named a new line at all. We're simply repeating ourselves. 
        
             
        
        
        
Answer:
-3/4 
Step-by-step explanation:
To find the slope, plug the coordinates into the slope formula. 
y2 - y1 / x2 - x1
4 - (-2) / -7 - 1
6 / - 8
-3/4 
 
        
             
        
        
        
Answer:
An improper integral is the limit of a definite integral as an endpoint of the interval of integration approaches either a specified real number or in some instances as both endpoints approach limits