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Answer

↓Steps Explained:↓

Display the interval notation for:

4b<20

Interval Notation Definition:

An interval as a set of numbers.
Numbers = endpoints.

Build interval notation

Inequality Sign Evaluation

You entered the < sign

b<5  ←Use this expression going forward

Build the interval notation for b:

No equal sign translates to ).
Do not include the number 5

Based on the < you entered,
the left side of the interval notation will extend to negative infinity,
which is denoted as -∞

Set Builder Notation for b:

{ b | b<5 } where | denotes such that

Final Answer