Answer:
1 1/5 or 6/5 
Step-by-step explanation:
So you get 2/5 every 1/2 hour so take the amount you have and times it by 3.
 
        
             
        
        
        
the population is the 40 seniors who were randomly selected and the sample is all seniors
 
        
                    
             
        
        
        
THE ANSWER WILL BE 3 BECAUSE I HAD DID MY MATH
        
             
        
        
        
You have (-3 +i)/(7 + i) so you need to remove the i from the numerator, so you have to multiply by 7-i and you get
(-22 + 4i)/50 which can be simplified to 
(-11 + 2i)/25
 
        
                    
             
        
        
        
Integral of 2sin(2x) is -cos(2x)
from 0 to pi/2 (sub pi/2 minus sub 0 for x) and then solve
= -cos(2*pi/2)-(-cos0)
= -cos pi + cos 0
= 1 + 1
= 2