Answer:
Using Pythagoras theorem.
In any right angle triangle:

As per the statement:
For the values a = 3.4 and b = 2.6, which are legs of a right triangle.
We have to find c, the hypotenuse:
Apply the Pythagoras theorem, we have;

Substitute the values we have;

then;
Therefore, the value of c, the hypotenuse, to the nearest tenth is, 4.3 units