3/5 + -1/5 help me please

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

How do i take any fraction and make it into a decimal or percentage?