1cm means 1 centimeter
centi=1000 so
1cm=1/1000m
1m=1000cm
so 27cm+1m+80cm=27cm+1000cm+80cm=1107cm=1.107m
To find this answer, we need to multiply 3.57 by 12.

Therefore, 12 planks will cost $42.84.
3.75 miles because 3/4 is .75 in money and the 3 is howm many miles
This is the fundamental zero additive rule
x - 0 = x
which means that for the set of real numbers, there exist a number such that if added (or subtracted) from any other will not affect such number.
It’s probably most definitely the third one but I really don’t know.