Expression equal to 10 3(3z 2)

I have been asked to find which expression is equal to 10 3(3z -2) out of 21z 2 , 21z 14 , 4 9z and 16 9z. I know it is either 4 9z or 16 9z but not sure which. Thanks; I have been asked to find which expression is equal to 10 3(3z -2) out of 21z 2 , 21z 14 , 4 9z and 16 9z. I know it is either 4 9z or 16 9z but not sure which. Thanks

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