If I painted two dots on one wall and then a third dot on another wall,
then those 3 dots are considered to
be ___. (Please fill in the blank
with the best answer choice)

I think the answer is autostereogram.

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3