Derrick received a total of 21 gift cards for graduation. He received gift cards in each of four denominations (sizes), $25, $50, $75, and $100. The number of $100 gift cards Derrick got was twice the number of $75 gift cards he received. The total value of the $50 gift cards he got exceeded (was above) the total combined value of $25, $75, and $100 gift cards by $100. How many $25 gift cards did Derrick get for graduation?

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

i hope this is what you were looking for.

see attached graph

hi! i think the answer is 1/2 : )

- (2, -7)

- lines r and s and lines t and u must be parallel