Answer: 14/33
Step-by-step explanation:
Since 2/9 of the umbrella are blue, the fraction for red umbrellas will be:
= 1 - 2/9
= 7/9
Since 5/11 of the red umbrellas have plastic covers. The fraction for those without plastic covers will be:
= 1 - 5/11
= 6/11
Therefore, the fraction of Michelle's red umbrellas that do not have plastic covers will be:
= 6/11 × 7/9
= 42/99
= 14/33
