Answer:
6.75 or 6 3/4
Step-by-step explanation:
First take the whole number and multiply that by 3.
2*3=6
Now, take the fraction and multiply that times 3.
1/4 as a decimal is 0.25. You can ignore the decimal point right now, but you have to remember it is there later.
So, whithout the decimal point, 25*3= 75.
Now, you add the decimal. The 75 is now 0.75, with the decimal.
Add the whole number and the decimal, and you have your answer! 
6+0.75=6.75. As a fraction this is 6 3/4
 
        
             
        
        
        
The answers are 2. B, 3. D, 4. C, and 5. A.
Step-by-step explanation:
Step 1:
For question 2. 
We subtract both sides by 4 to get

For question 3.  .
.
We divide the entire equation by 4 to get

Step 2:
For question 4. 
We multiply both sides by 4 to get


For question 5. 
We add 4 to both sides to get


So the answers are 2. B, 3. D, 4. C, and 5. A.
 
        
             
        
        
        
Answer:
180
Step-by-step explanation:
78+67+35 all added together make 180. Hope it helps!
 
        
                    
             
        
        
        
Answer:
c. (12.12, 18.48)
Step-by-step explanation:
Hello!
The study variable is X: number of times a racehorse is raced during its career.
The average number is X[bar]= 15.3 and the standard deviation is S= 6.8 obtained from a sample of n=20 horses.
To estimate the population mean you need that the variable has a normal distribution, in this case, we have no information about its distribution so I'll assume that it has a normal distribution. With n=20 the most accurate statistic to use for the estimation is a Students-t for one sample, the formula for the interval is:
X[bar] ± 

[15.3 ± 2.093 *  ]
]
[12.12; 18.48]
Using a significance level of 95% you'd expect that the true average of times racehorses are raced during their career is included in the interval [12.12; 18.48].
I hope it helps!