Use the quadratic formula to solve the equations . you will get the answers 
        
                    
             
        
        
        
Answer:
3/2
Step-by-step explanation:
 
        
             
        
        
        
I belive there is none because it lands on the origin for y.
        
                    
             
        
        
        
(a) 28%
(b) 24%
When calculating the total amount of people it come out to 150.
According to the table 42 people smoke. 42/150 is 28%
According to the table 36 people exercise regularly. 36/150 is 24%
        
             
        
        
        
Answer:
The correct answer is 
d. Sampling Interval = Population size ÷ Sample size.
Step-by-step explanation:
According to Johnstone et al., (2014) "<em>Once the auditor has determined the appropriate sample size, a sampling interval is calculated by dividing the population size by the sample size.</em>"
Thus,
Sampling Interval = Population size ÷ Sample size.
Johnstone, K., Rittenberg, L. and Gramling, A. (2014). <em>Auditing: A Risk-Based Approach to Conducting a Quality Audit.</em> Ninth Edition.