Question

please solve all of these. best answer will be marked as brainlist answer.

Answer 1

HOPE IT HELPS YOU MATE!!!

Answer 2

m=3
n=2
(1).9m²-10n³
=9×(3)²-10×(2)³
=9×9-10×8
=81-80
=1
(2).2m²n²
=2×(3)²×(2)²
=2×9×4
=72
(3).2m³+3n²-5m²n
=2×(3)³+3×(2)²-5×(3)²×2
=54+12-90
=66-90
=(-24)
(4).m^(n)-n^(m)
=3²-2³
=9-8
=1
(4/7)^(-5)×(7/4)^(-7)
=(4/7)^(-5)×(4/7)^(7)
=(4/7)^(2)
=16/49
please mark me as brainliest