Solution:
we are given that 
A school director Must randomly select 6 teachers to participate in a training session there are 30 teachers at the schoo. The order of selection does not matter.
As we know
6 teacheras can be selected out of 30 teacher in  ways.
 ways.

Hence the required number of ways is 593775.
 
        
             
        
        
        
Part a: subtract 48-30=18
Part b: i found it by subtracting 48 -30 because it says left over
        
             
        
        
        
Answer:
60-5x-10, 50-5x, 5(10 + x)
Step-by-step explanation: