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Could someone help using 8th grade exponents/real numbers?

Could someone help using 8th grade exponents/real numbers?-example-1
User PGH
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1 Answer

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$3*5=$15 (price of lunch)
15+5=20 (ticket cost)
20+2=22 (amount loaned to friend)
22+3=25 (amount left over)
he started with $25
User Skillit Zimberg
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