Question

81 mn - 21m from 11m - 18mn​

Answer 1

81mn-21m from 11m-18mn

81mn-18mn=63mn

from

11m-21m=10

Answer 2

$(11m - 18mn) - (81mn - 21m) \\ = 11m + 21m - 18mn - 81mn \\ = 32m - 99mn \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

here is your answer..........

mark me as brainlist...........