Answer:
a)  
  
b) 
c) Since the p value is higher than the significance level provided we have enogh evidence to FAIL to reject the null hypothesis and we can't conclude that the true means are different at 5% of significance 
Step-by-step explanation:
Information given
 represent the mean for 1
 represent the mean for 1
 represent the mean for 2
 represent the mean for 2
 represent the population standard deviation for 1
 represent the population standard deviation for 1
 represent the population standard deviation for 2
 represent the population standard deviation for 2
 sample size for the group 1
 sample size for the group 1
 sample size for the group 2
 sample size for the group 2
z would represent the statistic 
Hypothesis to test
We want to check if the two means for this case are equal or not, the system of hypothesis would be:
H0:
H1:
The statistic would be given by:
 (1)
(1)
Part a
Replacing we got:

Part b
The p value would be given by this probability:

Part c
Since the p value is higher than the significance level provided we have enogh evidence to FAIL to reject the null hypothesis and we can't conclude that the true means are different at 5% of significance 
 
        
             
        
        
        
Answer: 8.16•10^2
Step-by-step explanation:
Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 
10
. The sign of the exponent will depend on the direction you are moving the decimal. You do this to both equations and when you got the final answer of you divide the 2 equations and put it back in scientific notation Mark me brainliest
 
        
                    
             
        
        
        
A(6) and D(-4) are solutions to the equations
(6)^2 < 81  |  36 < 81
(-4)^2 < 81  |  16 < 81