Which description is paired with its correct expression?
seven less than the quotient of two and a number squared, increased by six; 7 minus StartFraction 2 Over n squared EndFraction + 6
nine times the difference of a number cubed and three; 9 (n cubed minus 3)
eight more than the quotient of a number squared and four, decreased by seven; 8 + StartFraction 4 Over n squared EndFraction minus 7
twice the difference of a number cubed and eight; 2 n cubed minus 8