Answer:
8.3
Step-by-step explanation:
 
        
                    
             
        
        
        
8.4 because 6 would round up to 10 and 10+30 =40 for 8.40 or just 8.4
        
             
        
        
        
Answer:
23m
Step-by-step explanation:
The product of a number m and the numeral 23 is 23m.
 
        
             
        
        
        
Answer:
B. Undefined
Step-by-step explanation:
A function cannot have more than one x value with different y values. A vertical line means this happens infinite times. It is undefined.
 
        
             
        
        
        
All 3 of the listed parallelograms have both pairs of sides parallel, by definition.
The square and the rhombus have all congruent sides.
Since the square and rhombus have all 4 congruent sides, this means their opposite sides are congruent.  Additionally, rectangles have opposite sides congruent.