The given equation is r(z) = 2√2.
To find (ra)(4), we substitute 4 for z in the equation r(z) = 2√2.
Substituting 4 for z, we have r(4) = 2√2.
Therefore, (ra)(4) is equal to 2√2.
Alternatively, we can calculate (ra)(4) by substituting 4 for z directly into the equation without the intermediate step of finding r(4).
Substituting 4 for z in the equation r(z) = 2√2, we have r(4) = 2√2.
Thus, (ra)(4) is equal to 2√2.
In summary, (ra)(4) is equal to 2√2.
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