Some of these homework questions made no sense to me. Please help!

Which of the following scenarios best describes the historical cost principle? _____

-Assets are carried on a company's books at purchase value, Exchange transactions determine the cost of asset value, A company frequently updates its assets values to current prices, Land Purchased 10 years ago is revalued annually at market value.

An example of the periodicity assumption is:

-A company that prepares financial statements each month, an overworked accountant who records business events when he has time, each accounting event and financial statement must follow the same time period, an owner that frequently looks at his checking account

On August 1, a business collected $3,300 rent in advance, debiting Cash and crediting Unearned rent revenue. That tenant was paying one year's rent in advance. At December 31, the business must account for the amount of rent it has earned. Indicate which category adjustment is described

-Prepaid expense, Depreciation, Accrued expense, Unearned revenue.

Which type of income statement account has the opposite type of balance as the Capital Account?

-Asset, Revenue, Liability, Expense

Which of the following would NOT be a note placed on a financial statement?

-CEO salary, An assumption regarding an asset, the use of FIFO to report inventory, Certain administrative expenses for given period

Sam runs a carwash. He uses a petty cash drawer to make quick payments for needed items. Lately, however, he is concerned that someone is using the money for unauthorized purposes. What should he do?

-Compare register receipts with petty cash receipts, only use petty cash for employee lunches, have a manager sign off on petty cash tickets, set up a second bank account for petty cash.

Thanks in advance!