Question

please help
1:Of the following, what is a power of Congress?
To create standards of weights and measures
To set local property tax rates
To regulate commerce within states
To set state sales tax rate
2:What part of the system of checks and balances is a power of Congress?
To decide what punishments can be set for a federal crime
To decide what punishments can be set for a federal crime
To decide with constitutes a federal crime
To establish federal courts
All of the above