Answer:
Two boxes will cost
The cost of one tile is approximately 
Step-by-step explanation:
Note that 1 ft = 12 in, then

The area of the floor is

Now

then
144 sq. in - 1 tile,
9540 sq. in - x tiles.
Mathematically,

tiles is needed to cover the floor (67 full tiles).
Each box of tiles contains 45 tiles, so Cristina has to buy 2 boxes. These two boxes will cost
The cost of one tile is approximately 
Answer:
every new hour, the previous amount of bacteria is multiplied by four.
Step-by-step explanation:
<h2>
Answer:</h2>
<u>First, Arrange the data in ascending order</u>
=> 18, 20, [21], 22, 23.
<u>Now, Find the middle term i.e, 21.</u>
<u>Hence, Median of the given data is 21</u>.