Which number gives you an irrational sum when you add it to 8 a√4 b 5/9 c√5 d-8

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Which statement is true about a number and its additive inverse? a. their product is always one. b. their sum is always one. c. they are always reciprocals of each other. d. their sum is always zero.