Answer:
And?
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
   B. Add 115+500 then subtract 3
   C. Add 112+500
Step-by-step explanation:
Any strategy that gives a sum of 612 will work. Strategy A gives a sum of 602, so is not useful.
The appropriate choices are B and C.
   B: 115 +497 = 115 +(500 -3) = (115 +500) -3
   C: 115 +497 = 115 +497 -3 +3 = (115 -3) +(497 +3) = 112 +500
 
        
             
        
        
        
Answer: d
Step-by-step explanation:
t= b1- B0/ SE(b1) = 2.37-0/0.65= 3.646 -> 3.65