A ball rolls down a ramp with a slope of -3/5. During its descent, the ball is at 15 feet at one point and 7 at another, as shown in the diagram. Find the horizontal distance (x) , in feet, that the ball traveled during the indicated spots.

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

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?