Answer:
The bacterium expels oxygen, making room for
hydrogen peroxide and carbon dioxide. These elements are then combined with solar energy to produce fuel.
Step-by-step explanation:
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If we let 
be the number of pages read in 1 hour, then in 7 hours Doug reads 
pages. We know that this number of pages is 231, so we have
Answer:
x=4
y=1
Step-by-step explanation:
4x=7y+9
4x+y=17
7y+9+y=17
8y=17-9
8y=8
y=1
so
4x=7*1+9
4x=16
x=16/4
x=4
Answer:
X= 5/3
Step-by-step explanation:
