Answer:
5
Step-by-step explanation:
No
No
No
Yes
Yes
They have to be whole numbers
Answer:
Amounts in the intervall 
Step-by-step explanation:
We will take the variables c and s, where
c = amount to spend that month
s = savings of the month.
Since each month we save at least 100, we know that

Moreover, we earn $250 per month and we spend $20 in a kayaking club, which tells us that

and so

By multiplying by -1, the first inequality also tells us that

Consequently by adding 230 to the inequality, we get that

It should stay the same bc even if you flip it and reflect it it shouldn't effect the area of it.