Question

I need help with these questions! Please help!!!!

Answer 1

1: (1)
2: 4-1= 3, 3÷6=1/2, 1/2=X
3: 5x-10=18, 5x=8, x=1.6
4:(x+5)÷3=7, x+5=21, x=16
5:((M-3)2)+8=26, (M-3)2=18, m-3=9, m=12