I think there are 88 different combinations of coins that can make up 66 cents.
6 ways
This question cannot be answered because many countries use cents as a unit of currency and these countries have different coins. Without knowing which coinage system you refer to, there can be no proper answer.
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I am assuming this means what different combinations of coins would add up to 17 cents. You could have one dime, one nickel and 2 pennies, 1 dime, 7 pennies 3 nickels, 2 pennies 2 nickels, 7 pennies 1 nickel, 12 pennies 17 pennies
A lot
The answer depends on the currency to which the question refers. The coinage for US, for example, is different to that for the Euro zone. There are many other countries that also use cents.
she could have 1 dime and 1 pennyshe could have 2 nickels and 1 nickel and 1 penny
Precisely 1. For ANY number n, the number of combinations of n of those items is always 1.
6 ways
There are sixteen different ways.
18
three twenty five cents, and three one cents
This question cannot be answered because many countries use cents as a unit of currency and these countries have different coins. Without knowing which coinage system you refer to, there can be no proper answer.
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The answer depends on the country or regions whose currency that the question is about. The Euro zone has coins of 1, 2 5 and 10 cents - not the same coinage as the US. So the answer will be different.