6 2/5 - 3 1/4 = 63/
20
= 3 3/
20
= 3.15
Answer:3.15
Hope this helps :)
So we know that the bacteria grows 3x as much every ten minutes. From this we know that it'll be 3 mm in 20 minute. Continuing the pattern, we can figure out that in 40 minutes the bacteria will be 81 mm.
The pattern: 10min - 3 20min - 9 30min - 27 40min - 81
Just add the side lengths together.
3x+3+2x+2+4x-1=9x+4
X = 4
Use division divide both sides by 3
3x/3 leaves x
12/3=4
Hope it helps
x=4
