ответьте на вопросы: how many cents are there in a dollar? what a other american coins? how many cents are there in a nickel, a dime and a quarter? надо!

There are 100 cents (or pennies) in one dollar.
For example: penny, nickel, dime, buck.
Nickel = 5 cents, dime = 10 cents, quarter = 25 cents.