Help me please this is confusing

16J(5exponent)K(3exponent)

First times the two numbers (4 x 4) which equals 16. And then J doesn't have an exponent but it automatically has one as it's exponent. So the other parenthesis has J with 4, just add the 4+1 and that equals 5 so that gives you 5 as the exponent. There isn't a K for the second parenthesis so you just leave it as k( 3 exponent)

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