Answer:
There will be 681 trillion atoms of hydrogen
Step-by-step explanation:
2:1 is the same as 2/1 so all you need to do is multiply 2 to the oxygen
3x+5=19
-5 -5
3x=14
/3 /3
x= 4 2/3
5, -4. that might not be right, though
ANSWER

EXPLANATION
We want to find the value of a for which the binomial, 2a-1 is smaller than the value of the binomial 7-1.2a by 7.
This means that, when we subtract 2a-1 from 7-1.2a, we should get 7.

Expand:

Group similar terms:


Divide both sides by -3.2,

