Two disinfectants were tested for their effectiveness against a strain of bacteria. Disinfectant A had a clear circle with 3 mm diameter.
Disinfectant B had a clear circle with 6 mm diameter.
Calculate the difference in the bacteria-free area between disinfectant A and
disinfectant B.
e:
6.8 mm2
4.7 mm2
9.4 mm2
21.2 mm2

is 84.78 mm^2

Explanation:

we will first find out their areas, the area to be found is of a circle R^2

for the first one,

R=radius

pi=3.14

so,=3.14*(3mm*)^2

=28.26mm^2

for the second one

=3.14*(6mm*)^2

=113.04mm^2

their differences are equal to 113.04 - 28.26

=84.78 mm^2

the overall balanced equation

6co2 + 6h2o > c6h12o6 + 6o2

sunlight energy

where: co2 = carbon dioxide

h2o = water

light energy is required

c6h12o6 = glucose

o2 = oxygen

the main thing i would use is bricks because if there is a hurricane, there is a great possibility for the house to still stand. and i would also use plexiglass windows instead of regular windows because plexiglass isn't prone to breaking.