In the equation \( T = 30 + 2x \), the variables can be reasonably represented as follows:
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\( T \): The total amount of money Johnny has saved after \( x \) weeks. This value represents his total savings for buying video games.
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\( 30 \): The initial amount of money Johnny has saved, which is $30 from his birthday money.
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\( 2 \): The amount of money Johnny saves each week, which is $2.
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\( x \): The number of weeks Johnny saves money. This variable represents the time period over which he is saving the additional $2 each week.
Thus, the equation indicates that after \( x \) weeks of saving, Johnny will have a total of \( T \) dollars to spend on video games.