The length of a rectangle is 7 centimeters greater than the width. The perimeter is 54 centimeters. Find the length and width.

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)

Sorry guys but as you have a small brain

Add the fractions and simplify 1/2+ 1/3