Choose the appropriate unit. the boy is 1.5

The approximate unit would most likely be years. When measuring the age of a person, one normally uses years. That's why all our birthdays are only once a year. In addition, it probably wouldn't be a good idea to say something like months, days, weeks, or centuries because those units are too small or too big. Decades could be used in this scenario, but it's unlikely. You normally don't say you are 1.5 decades old. You say you are 15 years old.

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let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

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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