<span>2r2 + 3s3 − r2 + 4t2 − r2
</span>
= 19
        
             
        
        
        
Answer:
5,580
Step-by-step explanation:
Rectangle: 36x30x60=6480
Triangle: 1/2x15x20x6=900
6480-900=5,580
 
        
             
        
        
        
Kinetic Energy 
=
1
2
m
v
2
=
1
2
1120
⋅
40
2
=
896000
J
=
8.96
⋅
10
5
J
        
             
        
        
        
Answer:
79 books
Step-by-step explanation:
45% books not returned = 55% books will be returned
145 books currently checked out
55% of 145 = 79.75
since you can't return 3/4 of a book, i would round down to 79.
 
        
             
        
        
        
Answer:
b. (4,1/2)
Step-by-step explanation: