Answer:
x=8
Step-by-step explanation:
6x+42=90
6x=48
x=8
 
        
             
        
        
        
Answer: Actually, you must use the Pythagorean Theorem! 
 
a squared plus b squared equals c squared. So if you substitute in the values, a is 2 units and b is three units. 2 squared is 4 and 3 squared is 9.
4 + 9 = 13 so the answer is the square root of 13. (√13)
 
        
             
        
        
        
Answer:
25 necklaces
Step-by-step explanation:
each necklace brings $16 profit (20-4=16)
400÷ 16= 25
so, at 25 necklaces, there will be enough profit to break even after paying for the advertising.