Answer:
x=4
Step-by-step explanation:
-8+2x= 3x-12 
-x=-4
x=4
 
        
                    
             
        
        
        
Answer:
120 grams will be left after 180 years.
Step-by-step explanation:
A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by
                                              
where, 
 = quantity of the substance remaining
 = quantity of the substance remaining
 = initial quantity of the substance
 = initial quantity of the substance
 = time elapsed
 = time elapsed
 = half life of the substance
 = half life of the substance
From the information given we know that:
- The initial quantity is 480 g,
- The half-life is 90 years,
- 180 years is the time elapsed.
And we want to find how much will be left. For this we use the above formula.

120 grams will be left after 180 years.
 
        
             
        
        
        
Answer:
x > 30
Step-by-step explanation:
x + 2 > 32
Subtract 2 from each side
x + 2-2 > 32-2
x > 30
 
        
                    
             
        
        
        
Answer:
The bottom two
Step-by-step explanation:
[] Similar beings their sides have equivalent ratios to each other
[] See attached
Have a nice day!
      I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather