Aman exchanged a dollar bill for change and received 7 coins, none of which were half
dollars. how many of these coins were dimes?

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

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b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

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