I am really confused on this question can someone help? I need an answer before Monday

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Step-by-step explanation:

1. For x jerseys, the cost from Print It is $21 each, so ...

  p = 21x

The cost from Top Print is less per shirt, but has a set-up charge. Its cost can be modeled by ...

  t = 45 +18x

These two costs will be the same when ...

  p = t

  21x = 45 +18x

  3x = 45

  x = 15

Purchasing 15 shirts from either supplier will cost $21·15 = $315. The lower per-jersey cost at Top Print will come into play if more than 15 shirts are ordered.

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2. Value Printing wants their pricing to be somewhere between the prices of the other two shops. That means their per-jersey cost will be somewhere between $18 and $21, and their setup cost will be less than $45. It also means their cost for 15 jerseys must be exactly $315, as it is for both other shops.

If we choose a per-jersey cost of $20 for Value Printing, then the setup cost must be ($315 -$20×15) = $15 in order for the cost of 15 jerseys to match the cost at the other shops. With these choices, at Value Printing, ...

nope.   happens to me as well.

-aparri

but there’s no any figure there!