Answer:
the first graph is 3:2
the second is 3:1 or 2:1 i'm not 100% sure on that one
the third is 1:1 
Step-by-step explanation: I took the test and got it right 
I hope this helps:)
 
        
             
        
        
        
Consider the number of the adult tickets is x
X+2x=276 
3x=276
X=92 
So the student tickets is =184
        
             
        
        
        
So your equation would be 37 + 9.70x
114 - 37 would get you 77 dollars. Next, you have to find out how many times 9.70 goes into 77. They would be able to rent the room for a total number of 7 hours because that's how many times 9.70 can fit into 77 evenly.
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  
The t distribution or Student’s t-distribution is a "probability distribution that is used to estimate population parameters when the sample size is small (n<30) or when the population variance is unknown".
The shape of the t distribution is determined by its degrees of freedom and when the degrees of freedom increase the t distirbution becomes a normal distribution approximately.  
Data given
Confidence =0.99 or 99%
 represent the significance level
 represent the significance level
n =16 represent the sample size
We don't know the population deviation 
Solution for the problem 
For this case since we don't know the population deviation and our sample size is <30 we can't use the normal distribution. We neeed to use on this case the t distribution, first we need to calculate the degrees of freedom given by:

We know that  so then
 so then  and we can find on the t distribution with 15 degrees of freedom a value that accumulates 0.005 of the area on the left tail. We can use the following excel code to find it:
 and we can find on the t distribution with 15 degrees of freedom a value that accumulates 0.005 of the area on the left tail. We can use the following excel code to find it:
"=T.INV(0.005;15)" and we got  on this case since the distribution is symmetric we know that the other critical value is
 on this case since the distribution is symmetric we know that the other critical value is 
 
        
             
        
        
        
Answer:
240/(v+40) + 1 > 240/v
Step-by-step explanation:
Both parties traveled a distance of 240 km.
Simpsons took off at average speed of 40 km/h & 1 hour later: 240/(v+40) + 1
Jacksons took off at average speed of v km/h:  240/v