Consider the matrix 0 -1 1 0 recall that r rotates a vector v e r2 by 90. does r have any eigenvalues/eigenvectors? if not, give a rough geometric explanation for why this might be.

Alandscaper is shopping for landscaping materials. she wants to use materials through which water flows easily. which materials should she choose? check all that apply. clay gravel granite rocks with cracks loosely packed soil