Can somebody help me with this work

Whose conclusion is correct? choose all that apply. (two max) elijah emily edward esme

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

Solve for n? [tex]z = \frac{3}{4} mn[/tex]