600,000+80,000+10 i'm word and standard form

What kinds of numbers have an odd number of factors?

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

10x − 5y + 14 = 0 whats the answer pls