Answer:
0 is the answer on 16 x 64y
 
        
                    
             
        
        
        
Answer:
   68 texts per day
Step-by-step explanation:
The description of the variables in the equation tells you that you want to find t (texts sent per day) for the given value of 'a' (age in years). 
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Substitute the number (15) for the variable (a) and do the arithmetic:
   t = -1.63a +92.14
   t = -1.63(15) +92.14 = -24.45 +92.14
   t = 67.69
Keiko's trend line estimates a 15-year-old would send about 68 texts per day.
 
        
             
        
        
        
<span>The first one is false, but the other two are true.
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 Dog No dog Total
 Cat 31 10 41
No cat 24 7 31
 Total 55 17 144