Answer:
The length of each side of the base is 
Step-by-step explanation:
we know that
The area of a square is equal to

where
b is the length side of a square
In this problem we have

so
substitute in the formula

Square root both sides


 
        
             
        
        
        
You take the first equation and make a value for y. So 6x + y =7 change it to :
y = -6x + 7
Now in the second equation replace the “y” with -6x +7 this is what it means to use substitution method . Your combined equation will now be :
8x + 9(-6x + 7) =17
Now do distributive property and you get :
8x + -54x +63 =17
Now combine like terms ;
-46x +63 =17
-46x =-46
x = 1
Now replace 1 for X value and we can get the value of Y . 
Y=1 
X=1
        
             
        
        
        
Answer:
We need to conduct a hypothesis in order to determine if the mean is greater than specified value, the system of hypothesis would be:      
Null hypothesis: 
      
Alternative hypothesis: 
      
For this case the significance is 1%. So we need to find a critical value in the normal standard distribution who accumulates 0.99 of the area in the left and 0.01 in the right and for this case this critical value is:

Step-by-step explanation:
Notation
 represent the sample mean
 represent the sample mean 
 represent the standard deviation for the population
 represent the standard deviation for the population      
 sample size
 sample size      
 represent the value that we want to test
 represent the value that we want to test    
 represent the significance level for the hypothesis test.
 represent the significance level for the hypothesis test.    
z would represent the statistic (variable of interest)      
State the null and alternative hypotheses.      
We need to conduct a hypothesis in order to determine if the mean is greater than specified value, the system of hypothesis would be:      
Null hypothesis: 
      
Alternative hypothesis: 
      
For this case the significance is 1%. So we need to find a critical value in the normal standard distribution who accumulates 0.99 of the area in the left and 0.01 in the right and for this case this critical value is:

 
        
             
        
        
        
Answer:
 Find out the how many pizzas are delivered to a customer who pays $80 .To proveAs It is not stated, but implied that all pizzas cost.
Step-by-step explanation:
brainliest please