1 < 4d +9 < 21
graph it on the number line

See the diagram below.

The graph consists of a closed circle at -2, an open circle at 3, and shading in between.

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Work Shown:

Notes:

In the 2nd step, I subtracted 9 from all sides to undo the "plus 9"

In the 4th step, I divided all sides by 4 to undo the multiplication.

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To graph this, you'll have a closed circle at -2 and an open circle at 3. The shaded region is in between. The open circle means "do not include this endpoint".

See the diagram below.

coin flip

non-answer:

choosing

sorry if this isnt what you're looking for i dont really understand the question