Answer:
$12
Explanation:
If Ryan owes his mom 18 dollers, that means he has to pay his mom 18 dollers and then gets 30 dollers in return.
so the expression is -18+30 which is 12 dollers. So Ryan will have 12 dollers extra after paying is mom.
Don't know if there's more to this.
He Owes –$18
He gets +$30 for cleaning the house.
He'll simply have 30–18 = $12 after paying the debt he owes his Mom.
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