Answer:
b) 25/100 x 79
= 19.75
= 79 - 19.75
= $59.25 (before tax)
7/100 x 59.25
= 414.75/100
= 4.15
= 59.25 + 4.15
= $63.4 (after adding tax)
First we have to take out the percentage of discount and minus it from the total cost . To find the discounted price with tax, we have to take out the percentage of the tax from the discounted amount and add it to the discounted amount to get the total cost.
Step-by-step explanation:
 
        
                    
             
        
        
        
Step-by-step explanation:
We need to find an expression for  .
.
We can solve it as follows.
We know that,

So,

or

Hence, this is the required solution.
 
        
             
        
        
        
Answer:
rational 
Step-by-step explanation:
enjoy the great answers 
 
        
                    
             
        
        
        
You replace the y with f(x)
So it becomes f(x)=2x+1