function notation is the way a function is written. It is meant to be a precise way of giving information about the function without a rather lengthy written explanation.
        
                    
             
        
        
        
Just substitute wherever x is for example 2 times 3.5
        
             
        
        
        
Answer:
x>15
Step-by-step explanation:
Given the inequality: 2x + 10 < 4x - 20
Collect like terms
2x-4x<-20-10
-2x<-30
x > -30/-2
x>15
Hence the solution is x>15
 
        
             
        
        
        
Answer:
3n/8 ≤ 13
Step-by-step explanation: