Plsss answer I need help now
Patulong po thank you:)
Sana po matulongan nyo ako

Answer:
8m-5
=8(3)-5
=24-5
=19
3y²+xy-1
=3(2)²+(1)(2)-1
=3(4)+2-1
=12+2-1
=13
1/3 6a²+7(a+b)
=1/3 6(2)²+7(2+5)
=1/3 6(4)+7(7)
=1/3 24+49
=8+49
=57