Find the domain plz I need help

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

- (2, -7)

- lines r and s and lines t and u must be parallel

60.9774

step-by-step explanation:

because when you add 47.6 plus 7.32 equals 54.92

and when you add .0574 + 6= 6.0574

and when you add 54.92 and 6.0574 you get the answer of 60.9774.

plzz mark brainlest last one got deleted. cause i didn't explain it but i did but i understand what the mod meant