# Chapter R - Section R.1 - Basic Concepts - R.1 Exercises: 86

$5x+4\geq21$

#### Work Step by Step

We are given the statement '$5x+4$ is greater than or equal to 21.' Therefore, we can write this statement as an inequality by adding a greater than or equal to sign between $5x+4$ and 21. This statement is written in inequality form as $5x+4\geq21$.

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