In a glide reflection, what comes first and what comes second?

A glide reflection is a composition of transformations.In a glide reflection, a translation is first performed on the figure, then it is reflected over a line. Therefore, the only required information is the translation rule and a line to reflect over. ... The first one is a translation rule.

the answer is 0.3175 hope that you ^w^

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understand that i don't know the answers

will someone answer his question