Five and nine hundred twenty-one thousandths
This question is asking which two numeric values are closer to each other. The smallest gap in between Mercury, and Helium, which is the answer
The
first graph.
The equation is x - 1

3
In order to solve it, you need to get x by itself.
Add 1 to both sides. 3+1=4
x

4
Since this is your sign

the arrow has to point towards the left, and the circle needs to be colored in.