Answer:
D
Step-by-step explanation:
the perimeter of a shape is the sum of it's sides
in a square all sides have the same length
here all sides are 1 inch
so 1+1+1+1 = 4 inches which is D
Scrubbing the floor=15:00$
Dusting=15:00$
Total:30:00$
18.) 13.796
19.) 39.99
21.) 14.82
22.) 2.23
The decimal doesn't matter for subtraction and addition. It just goes down with the answers.