Answer:
32 × 10^(10k)
Explanation:
y = 16 x 10^8k
y^5/4 = ⁴√y^5
= ⁴√16^5 x 10^40k
= ⁴√2^20 x 10^40k
= 2^5 × 10^10k
= 32 x 10^(10k)
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