Find the missing side round to the nearest tenth

What is 20+(5 x 2/5 )+ 3 show your work

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

Is the square root of 4 plus the square root of 16 rational?