Answer:
60th visit
Step-by-step explanation:
60/12=5
 
        
             
        
        
        
We have
<span>3/5=(a+5)/25
3/5=(5/5)*(3/5)=15/25
therefore
15/25=</span>(a+5)/25<span>
15=a+5------------------------ > a=10
the answer is the option </span>a = 10
        
                    
             
        
        
        
<span>To find what percent one number is of another number, write the two numbers as a fraction, with the whole as the denominator. Then find an equivalent ratio with a denominator of 100 and write that ratio as a percent.</span>
        
                    
             
        
        
        
Answer:
DEF
Step-by-step explanation:
DEF is half of ABC, which means they're both similar in some way.
As we can see line DE is half of line AB (DE is 5.5 and AB is 11)
Line DF and Line EF are half of Line AC and Line BC (DF/EF is 4 while AC/BC is 8)
 
        
             
        
        
        
The answer is 
7.9306Using the formula in the attached:
Where: xi = sample value; μ = sample mean; n = sample size
1.) Calculate the mean first:
μ = 12.0 + 18.3 + 29.6 + 14.3 + 27.8 / 5
   = 102 / 5
μ = 20.4
2.) Using the mean, calculate (xi - μ)² for each value:
(12.0 - 20.4)² = 70.56
(18.3 - 20.4)² = 4.41
(29.6 - 20.4)² = 84.64
(14.3 - 20.4)² = 37.21
(27.8 - 20.4)² = 54.76
3.) Sum the squared differences and divide by n - 1.
μ = 70.56 + 4.41 + 84.64 + 37.21 + 54.76
   = 251.58 / 5-1
μ = 
62.895 (this is now called sample variance)
4.) Get the square root of the sample variance:
 √62.895 = 
7.9306