c = 5n
the cost (c) would equal (=) the number or notebooks (n) times $5 (5) because each is five dollars.
        
             
        
        
        
6,8
9,7 
13,1
im srry thats all i know :(
 
        
                    
             
        
        
        
Answer:
 L = 315 cm2 ; S = 399.9 cm2
Step-by-step explanation:
Lateral area;
3 × (½)(14)(15)
315 cm²
Surface area:
315 + (½)(14)(14)sin(60)
399.8704896 cm²
 
        
             
        
        
        
Answer:
x = 20
Step-by-step explanation:
90 = 60 + (x + 10)
90 - 60 = x + 10
30 = x + 10
30 - 10 = x
20 = x
 
        
                    
             
        
        
        
Answer:
The answer is 1st point, 1/2×22.0×23.1
Step-by-step explanation:
You can let XY be the base and XZ be the height of the triangle. Then, by using the formula of the area of triangle, A=1/2×base×height to find the expression.