Question

HELP!!!!
Attachment is in the comments

Answer 1

I'm pretty sure, not 100% positive that it's. D, D, A. But I can't exactly remember what it means when you have the lines -> | x|

Answer 2

absolute value of a=a
absolute value of -a=-(-a)

then qst 1
absolute value of -15=15

qst2
absolute value of 12=12
absolute value of -8=8
12-8=4

qst3
absolute value of -4=4
absolute value of -6=6
4+6=10

Answer 3

Thank you so much <3 :)