Three numbers add up to 180. the second number is twice the first, and the third number is three times the first. what is each number?

Can someone me out here number 4 plz

What is the slope of the line that contains the points (-2,1) and (0,-3)

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?