Select all statements below which are true for all invertible × matrices and A. =AB=BA

B. 4A is invertible

C. (A+B)^2=A^2+B^2+2AB

D. A+B is invertible

E. (A+A−1)^9=A^9+A^−9

F. (I−A)(I+A)=I−A^2

Construct the graph that models the given situation

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.

Jessica is organizing a guided tour of the rain forest. the average profit per person that the touring company makes is given by the rational expression 18x+35/x, where x is the number of people going on the tour. what does the numerator of this rational expression represents?