Please help! I think this is a simple question but I'm overthinking.

We have the following:
We can solve this question by means of the Pythagorean theorem since it is a right triangle, in the following way:
[tex]c^2=a^2+b^2[/tex]a = 2.3
b = 3.4
replacing
[tex]\begin{gathered} c^2=2.3^2+3.4^2 \\ c^2=5.29+11.56 \\ c=\sqrt[]{16.85} \\ c=4.1 \end{gathered}[/tex]Therefore, the answer is 4.1