Answer:

Step-by-step explanation:
Given



Required
Determine n using inequality
The three sides of the triangle must satisfy two of the following conditions



Substitute values in the above inequalities;



Solve each of the inequalities









Since, the second inequality has negative, we simply ignore it
So, we combine the first and the third:
and 
and 
Combine both

<em>The second question is not clear and it is unanswerable</em>
You forgot to include pic of all expressions below
EXPLANATION
Since working alone, Kevin stuffs 1000/4 = 250 shrimps/h
Then, when his sister helps him, they both stuffs 1000/3 = 333.3 shrimps/h
Therefore, the sister stuffs 333-250 = 83 shrimps/h
Now, we can compute the sister can stuff 500shrimps in 500/83 = 6 hours
In conclusion, the solution is 6 hours.
X is 20 because if you do 7x + x +20 = 180 you would have 8x + 20 = 180 the subtract 20 which = 160 then divid 8 by 160 which = 20
The value of X=28 while the value of y=28,hopefully this is right