Answer:
16,17,18,19
Step-by-step explanation:
one guy guessed. probably using a calculator
another guy took the 4th root of 100,000 and rounded down a number
(a third way started like this
n*(n+1)*(n+2)(n+3)=100000
 
        
             
        
        
        
Erm..
9 I guess..
Good luck?
        
             
        
        
        
It appears that you have here a list of the # of minutes spent each day on HW, and that y ou need to sum up this list to answer the question.  Unfortunately I cannot read the last numeral.
The answer (assuming that my guess is correct) would be found as follows:
Total hours spent on HW in one week = (18+20+22+11+19+18+ ?? )
                                                                
        
             
        
        
        
ANSWER
The restrictions are

EXPLANATION
We were given the rational function,

The function is defined for all values of a, except 

This has become a quadratic trinomial, so we need to split the middle term.
We do that by multiplying the coefficient of  which is 5 by the constant term which is 3. This gives us 15.
 which is 5 by the constant term which is 3. This gives us 15.
The factors of 15 that adds up to 16 are 1 and 15.
We use these factors to split the middle term.

We now factor to get,

We factor further to get,

This implies that,

This gives

These are the restrictions.