Erica wants to know how many books on average are in school libraries in her county. she randomly calls 50 school libraries in her county and finds out how many books they have. she adds the number of books together and divides by 50. her conclusion is there are an average of 18,000 books in a school library. erica's conclusion is

here is the

mark brainliest pl

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