Question

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Answer 1

start with the line
"you must have at least 5 notebooks"

assume we use x and y for the number of each type of notebook.

can you change the words into a math relation?

start with "the sum of the two types of notebooks must be 5 or bigger"

Answer 2

Y= spiral notebooks
X= 3-ring notebooks

x + y >=5
6x + 3y <=24

So

y>=5-x

And
y<=(24-6x)/3
y<=8-2x

Third answer is right

Answer 3

I thought it was B? @phi

Answer 4

@gaos

Answer 5

my bad, b is right