Answer:
Depends on the bathroom
Step-by-step explanation:
Basically since I don't know the bathroom length and width, Ima just cut it down for you.
It is your bathroom area (length*width) divided by the area of the tiles, which is 1*1=1 foot^2(square)
Also it depends on the unit you used for the bathroom, you gotta transfer the unit for the bathroom length and width into feet.
So you should get number for bathroom area with the unit feet square.
U can find the common ratio by dividing the 2nd term by the first term
r = -9/3 = -3
an = a1 * r^(n - 1)
a1 = 1st term = 3
r = common difference = -3
now sub
an = 3 * -3^(n - 1) <== ur formula
domain : all integers where n > = 1 <==