The length of a rectangle is four times its width. If the perimeter of the rectangle is 80m , find its length and width.

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

What is the value of x in the this question ?

Two numbers have a sum of -19. one number is x. what expression represents the other number?