Answer:
A, C, E for the first one; B, C, E for the second one; B and E for the last one
Step-by-step explanation:

the idea being, you multiply the "x" by some power of 10 that moves the repeating part to the left of the decimal point and the split it like above.
It should be a 80 degrees.
Yes because volume has 3 dimensions, hence the power of 3