Which of the following is not a way to determine if a relation is a function?

a.
use the vertical line test on a graph of the relation.

b.
check to see if each input maps to only one output.

c.
there should be no duplicated x-coordinates in the ordered pair set.

d.
determine if the relations’ graph forms a line.

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

df =

both have same length

where is the option given