Finding the Modulus of a Complex Number

Consider the complex number $z = 3 + 4i$. To find the modulus of this complex number, you would calculate it using the formula:

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

where $a$ is the real part and $b$ is the imaginary part of the complex number. Using this information, what is the modulus of the complex number $z$?