How many 2-letter code words can be made from the letters b, c, d, e, and f if repetition of a letter is not allowed?

Is the open sentence 5x-2=3x+2 true when x=2? justify your answer.

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

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?