): Please can someone help me with these questions , im stressed out already pls! Thank you

15. k=21  answer 21

16. r=-11 answer -11

17.  m= 26

18. p=17

4 & 3

step-by-step explanation:

factor of 108=2×2×3×3×3=2×2×3^3=the number is 4 because 2 only occurs 2 times and 2×2=4 and factor of 2187=3^3×3^3×3=the number is 3 because 3 onlyvoccur 1 time.

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step-by-step explanatio89