Answer:
40
Step-by-step explanation
x=40 because if you time these in like this:
3(40)-10= 110
40+15=55
If you user 65 it'll be wrong because:
3(65)-10=185    
And the whole thing is only 180 :]
 
        
             
        
        
        
8.9mm/10 = 0.89cm. since 10mm is 1 cm.
        
                    
             
        
        
        
Simplfy in to y=mx+b form
-3y=-10x-6
y=10/3x+2
        
             
        
        
        
Answer:
 = 150 square units
Step-by-step explanation:
Area of a right triangle is given by the formula;
1/2 bh ; where b is base and h is the height of the triangle
using Pythagoras  theorem, we can find the height;
h² = 20² - 16²
h = √144
   = 12 units
The base of the small triangle can also be found using Pythagoras theorem;
b² = 15² - 12²
b  = √ 81 
    = 9 
Therefore; 
Area = 1/2 bh
         = 1/2 × 12 × (16+9)
         = 1/2 × 12 × 25
         = 6 × 25 
         = 150 square units or 150 u²
      
 
        
                    
             
        
        
        
Answer:
the number = 8/5 or 1 3/5 or 1.6
Step-by-step explanation:
n = the number
5/2n - 11 = 4
5/2n - 11 + 11 = 5 / 2n
5/2n = 4
5/2n / 5/2 = n 
4 / 5/2 = 8/5