Respuesta :

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Amount saved every day
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$ 10 - $7 = $3

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Amount saved in a week
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$3 x 7 = $21

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Answer: $21
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lisetteilozo
21 dollars
Because if he gains 10 dollars every day for a week multiply 10 by (for the days in a week) and you should get 70. Then because he uses 7 of those 10 dollars multiply 7 by 7 to get 49 and that is how much he used so then you need to take 70 and subtract 49 which should give you 21