The way I figured this one out was saying that if it takes 2lbs to stretch it to 12 inches and 5lbs to stretch to 18 inches that means that 3 additional pounds = 6 inches. Therefore, each additional pound is 2 inches. We know already that with 2 lbs it was 12 inches in length and we can also say that 2 lbs = 4 inches. So subtract 4 from 12 and you end up with the answer of 8 inches. 
        
             
        
        
        
 <span><span>8x</span>+<span>10y</span></span>=<span>9
Hope this helps.</span>
        
                    
             
        
        
        
The total bill amount before the service fee is given as $45.
We are given that the tip she wants to leave is 15% of the bill amount, this means that:
tip value = 0.15 * 45 = 6.75$
The total bill would be the summation of the original bill and the tip value she left.
Total bill amount = 45 + 6.75 = 51.75$
        
                    
             
        
        
        
Answer:
2+2 is 4
Step-by-step explanation:
You can imagine 2 cookies and then you get 2 more which is 4.