The unit rate of flowers per vase is 7, the correct option is B.
Given
There are 84 flowers were placed in 12 vases.
A unit rate means a comparison between 2 units and the superiority and difference between both of them.
The unit rate is given by;
[tex]\rm Unit \ rate =\dfrac{Number \ of \ flowers}{Flower \ placed \ in \ vases}[/tex]
Substitute all the values in the formula;
[tex]\rm Unit \ rate =\dfrac{Number \ of \ flowers}{Flower \ placed \ in \ vases}\\\\Unit \ rate =\dfrac{84}{12}\\\\Unit \ rate =7[/tex]
Hence, the unit rate of flowers per vase is 7.
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