Here are the simplified expressions:
4*(5-y)-30= 20 - 4y - 30= -4y - 10
-8*(9+X)+50= -72 - 8X + 50= -8X - 22
(-12)*(-a-2)-10= 12a + 24 - 10= 12a + 14
-19*(2-x)+20= -38 + 19x + 20= 19x - 18
16*(7-a)-90= 112 - 16a - 90= -16a + 22
-15*(x+4)+60= -15x - 60 + 60= -15x
Here are the simplified expressions:
4*(5-y)-30
= 20 - 4y - 30
= -4y - 10
-8*(9+X)+50
= -72 - 8X + 50
= -8X - 22
(-12)*(-a-2)-10
= 12a + 24 - 10
= 12a + 14
-19*(2-x)+20
= -38 + 19x + 20
= 19x - 18
16*(7-a)-90
= 112 - 16a - 90
= -16a + 22
-15*(x+4)+60
= -15x - 60 + 60
= -15x