Can you tell me if I got these right

If I didn't,can you let me know what I did wrong/how to do it?

*Evaluate 3x - 2y³- IaI x= 4,y= -2,a= -1

3(4) - 2(-2)³ - I-1I
3(4) -2(-8) -1
12-16-1
= -5


*A=1/2h(B+b) A=180,B=11,b=7

180=1/2h(11+7)
180=1/2h(18)
360=h(18)
20=h


*Simplify 13(x - 4) - (9x+3)

-3x+12-9x+3
-12x+12-3
= -12x+9
Thank you! :)

All of them are right except for the last one.

If its 13(x-4) - (9x+3) then the answer is 4x - 55

If its -3(x-4) - (9x+3) then the answer is correct