Fx + y is rational, must x and y each be rational? a) yes; because the sum of rationals is rational. b) no; because the sum of irrationals is always irrational. c) no; because x and y could be additive inverses of each other. d) yes; because x and y must be integers, and integers are rational.

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?