SOLUTION
We know that the diameter of the circle is 18.8.
Therefore the value of its radius will be.
[tex]\frac{18.8}{2}[/tex]And we also know that the radius from the diagram is:
[tex]x+4.2[/tex]So we can equate both equations together to have an idea of what will give us the value of x.
[tex]\begin{gathered} \frac{18.8}{2}=x+4.2 \\ \text{Collect like terms} \\ \frac{18.8}{2}-4.2=x \end{gathered}[/tex]So going by the above solutions, the answers we will drag into the two boxes will be the 4th expression and the 6th expression
THAT IS:
[tex]\begin{gathered} \frac{18.8}{2} \\ \text{and} \\ -4.2 \end{gathered}[/tex]