Finding the Modulus of a Complex Number

Consider the complex number represented as:

$$z = 3 + 4i$$

where $i$ is the imaginary unit. You need to find the modulus of this complex number. The modulus of a complex number $a + bi$ is given by the formula:

$$|z| = ext{sqrt}(a^2 + b^2)$$

Calculate the modulus of the given complex number and provide your answer in the grid. Remember to write only the positive value of the modulus.