Which shapes do not contain any acute angels

On #16 : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.

The dash figure is a dilation if the original figure. find the scale factor. classify the dilation as an enlargement or a reduction

Which statement accurately describes how to perform a 90° clockwise rotation of point a (1,4) around the origin?