Answer:
ag=74 and ed=83
Step-by-step explanation:
super simple actually 
 
        
             
        
        
        
The answer is B.
There are about 391,000 of plants currently known to science.
Hope this helps.
 
        
                    
             
        
        
        
4*d^(-3)*d^18 = 4*d^(18-3) = 4*d^(15).  The trick here is to combine the exponents.
Another way to write this problem would be:
4*d^18
---------- .  Here d^18 divided by d^3 results in d^15, so again the final 
  d^3         answer is 4*d^15.
        
             
        
        
        
Answer:
7
Step-by-step explanation:
16x-80+18=4x+22
16x-62=4x+22
12x-62=22 
12x=84
x=7