I need answer for 7 plsss

What is the smallest integer n such that n\sqrt{2} is greater than 20

Which composition of similarity transformations maps polygon abcd to polygon a'b'c'd'? a dilation with a scale factor less than 1 and then a reflection a dilation with a scale factor less than 1 and then a translation a dilation with a scale factor greater than 1 and then a reflection a dilation with a scale factor greater than 1 and then a translation

Select all of the following expressions that are equal to 2.5.