Does someone know what would be the reason for number 4?

The reason for the statement 4 is CPCTC.

Step-by-step explanation:

Hope it helps you!

one that is bigger than 3 1/2

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt