30 POINTS! HELP ME PLZZ !!

Pick the expression that matches this description: a polynomial of the 5th degree with a leading coefficient of 7 and a constant term of 6 (choice a) 7x^5+2x^2+6 (choice b) 7x^6−6x^4+5 (choice c) 6x^7−x^5+5 (choice d) 6x^5+x^4+7

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.