Question

9^? × 729 = 3^4 × 9^6 ÷ 81​

Answer 1

Refer the attachment above.

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Answer 2

let that ? be n

then,

9ⁿ * 9³=3⁴ * (3²)^6/3⁴

3²ⁿ * 3^6=3¹²/3⁴

3²ⁿ=3^8/3^6

3²ⁿ=3²

2n=2

n=1