Answer:
15x + 42y = $13 050
Step-by-step explanation:
hope that helped :)
 
        
             
        
        
        
Here, y = -15 with x = -20
LCM of 15 & 20 is 60, so divide 15 & 20 from 60, 
60/15 = 4 & 60/20 = 3
Now, multiply the results with intial values, 
4y = 3x
y = 3/4 x
When y = 12, 
x = 12 * 4/3
x = 48 / 3
x = 16
In short, Your Answer would be 16
Hope this helps!
        
             
        
        
        
Answer:
Arsenic-74-is used to locate brain tumors. It has a half-life of 17.5 days. ... C. Find the amount remaining after 6 days from a 90-mg sample
 
        
                    
             
        
        
        
The second one I beileve is the answer to your question
        
             
        
        
        
In highest poer of placholder is  1 then it is linear
1/3x^1-2y^1=7
it is linear
yes it is