There are four swimmers in a race there will be a first place 2nd place and a third place prize awarded in how many different ways can the three prizes be awarded

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

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