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27. <

28. <

29. =

30. =

Step-by-step explanation:

For absolute value, the value can never be negative unless a negative sign is in front of the absolute value equation. For example |-4| is positive 4 ,but -|-4| is -4. Another way is if you know what multiplying each sign is.

For the fractions, you need to change the fractions to a equal denominator. Hope this helps.

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10