Let upper a equals left bracket start 2 by 2 matrix 1st row 1st column negative 2 2nd column 4 2nd row 1st column 1 2nd column 3 endmatrix right bracketa=−2 41 3, and upper b equals left bracket start 2 by 2 matrix 1st row 1st column negative 2 2nd column 1 2nd row 1st column 3 2nd column 7 endmatrix right bracketb=−2 13 7.a. findabab, if possible. b. findbaba, if possible. c. are the answers in parts a and b the same? d. in general, for matrices a and b such that ab and ba both exist, does ab always equal ba? a. findabab, if possible. select the correct choice below and, ifnecessary, fill in the answer boxes to complete your choice.

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3

Read the excerpt from the strange case of dr jekyll and mr. hyde what do dr. jekyll's thoughts reveal about him in this excerpt? [t]he inmates of my house were locked in the most rigorous hours of slumber, and i determined, flushed as i was with hope and triumph, to venture in my new shape as far as to my bedroom. i crossed the yard, wherein the constellations looked down upon me, i could have thought, with wonder, the first creature of that sort that their unsleeping vigilance had yet disclosed to he is jealous of those who can sleep through the night. he is revered for his scientific advances. he is interested in studying the movements of the stars he is proud and enthusiastic about his initial results.

Having a hard time understanding this question (see attachment).