Answer:
22,5 km
Step-by-step explanation:
 
        
             
        
        
        
Answer:
2a + 4c = 95
3a +7c =155
Step-by-step explanation:
2a + 4c = 95
3a +7c =155
 
        
             
        
        
        
Answer:
7x^2 + 14x - 12
Step-by-step explanation:
Add like terms:
(4x + 8x - 5) + (3x2 + 6x - 7) becomes:
   4x^2 + 8x - 5               or (grouping like terms in columns):
+ 3x^2 + 6x - 7
---------------------
  7x^2 + 14x - 12
 
        
             
        
        
        
<u>Answer</u>
95,040
<u>Explanation</u>
The interpretation of this expression is; the number of permutation of 5 objects out of 12.
12P5 = 12!/(12-5)!
         =12!/7!
         =(12×11×10×9×8×7×6×5×4×3×2×1)/(7×6×5×4×3×2×1)
         =12×11×10×9×8
         =95,040
        
             
        
        
        
Part a: subtract 48-30=18
Part b: i found it by subtracting 48 -30 because it says left over