Hey there! 
-4.5 * (-22.1)
= -4.5(-22.1)
= 99.45
4.5 * 22.1 
= 99.45
-45 * 2.21
= -99.45
-45(2.21)
= -99
Therefore, your answer is: 
Option C. 
Good luck on your assignment & enjoy your day!
~Amphitrite1040:) 
 
        
             
        
        
        
X+y=155. Y= -x+155
1.50x +4(-x+155)= 520
1.50x-4x+620=520
-2.5x =-100
X= 40. Y=110
        
             
        
        
        
F(x)=5x^2 Has minimum (0,0)
g(x) = f(x) + 2 Shifts the graph two units up, then the minimum is 2+0=2.
h(x) = g(x+4) Shifts the graph four units left,  then the minimum is at 0-4 = -4.
Then h(x) = 5(x+4)^2 + 2 has the minimum (-4,2)
And p(x) = -5(x+4)^2 + 2 has the maximum (-4,2)
 
        
             
        
        
        
6 books at $ 8 = (6 * 8) = 48
if he got a discount of 20%, then he paid 80%
0.80(48) = 38.40 <== what he paid