A12-ft by -15-ft rectangular swimming pool has a 3-ft-wide no-slip surface around it. what is the outer perimeter of the no-slip surface?
78 ft
78ft 2
198 ft
198 ft 2

The pool and the no slip surface around it form a rectangle

with:

length = 15 ft + 3 ft + 3ft = 21 ft

width =  12 ft + 3 ft + 3ft = 18 ft

The perimeter of this rectangle is 21 ft +21 ft +18 ft +18 ft = 78 ft

78 ft

Ican't read this very blury