How many distinct pairs of disjoint non-empty subsets of a are there, the union of which is all of a?
a={1,2,5,6,8}

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

wedfghjkl;

tyuiop[]ghjkl;

step-by-step explanatio89