Answer:

Step-by-step explanation:

$6!
10% is $3, you just move the decimal to the left one space, and that's 10%, so double is $6
If you would like to know the length of each side of the patio, you can calculate this using the following steps:
an area ... 200 square feet
a ... the length of one side
area = a * a = a^2
200 = a^2
a = sqrt(200)
a = 14.14 feet
The correct result would be 14.14 feet.