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Math·Algebra·Linear inequalities in one or two variables

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Cristina was elected to the city council. Each city council person is required to attend at least 21 of the 27 scheduled council meetings in a year to keep their position. Which inequality represents the number of city council meetings, $x$, Cristina must attend in a year to keep her position on the city council?

A

$x\le 21$

B

$x\ge 48$

C

$21\le x\le 27$

D

$27\le x\le 48$