Answer:
21 tribbles on the 7th night
Step-by-step explanation:
every night 3 tribbles appear meaning that the tribbles spawn rate is y=3x
y= number of tribbles
x= number of nights
Answer:
17550 solutions
Step-by-step explanation:
Given that:
y1 +y2+y3+y4=27
where;
(yi ≥ 0 and yi
)
The no. of a nonnegative integer determines the number of ways to choose 27 objects from (4) distinct objects with repetition regardless of the order.
i.e

∴
The number of nonnegative integer solution is 





= 17550 solutions
500 grams I think it probably will be wrong but worth a try
2x-4x
is an expression that equals too -4 if thats what u were looking for