Use desmos!!! It’ll help and show you a graph!!
        
             
        
        
        
You would either start at 0 and go over 235  then you would go over 123 more
        
             
        
        
        
Answer:
after 10 seconds  the charge  is 1.624 
Step-by-step explanation:
I think your question missed key information, allow me to add in and hope it will fit the orginal one. 
The electrical charge on a metal plate is given  by the function below, where t is the time in  seconds. What is the charge after 10 seconds?
C (t) = 12 
 
My answer: 
Given the information: 
C (t) = 12 
  
when t =10 we have: 
C (10) = 12 
 
<=>  C (10) = 12 
 
<=>  C (10) = 12 
 
<=> C (10) = 12 * 0.1353 
<=>  C (10) = 1.624 
Hence, after 10 seconds  the charge  is 1.624