A line graph would be useful for: a.
Displaying information that does not change over time.
c.
Displaying data that uses parts of a whole.
b.
Displaying data that changes continuously over time.
d.
Displaying data that does not represent a trend.

D.

Step-by-step explanation:

The whole point of a line graph is keep track of data that is always changing. For example, a line graph would be used to track the change in weather.

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