Answer:
I think it is the second one
Step-by-step explanation:
 
        
             
        
        
        
Answer:
x=3
Step-by-step explanation:
 
        
             
        
        
        
Answer: $18.19
Step-by-step explanation:
The tax is applied after the discount so first find the discounted price:
= Price * ( 1 - discount rate)
= 20 * ( 1 - 15%)
= $17
The sales tax of 7% can then be applied:
= Price * ( 1 + tax rate)
= 17 * ( 1 + 7%)
= $18.19
 
        
             
        
        
        
Good afternoon. 
120square --- 34h
 x   square ---   1h
      34x = 120
     x = 120/34
   x = 3,5 square