The function f:0,+)R defred by f6)-2 l has iminsse funcdiconi a.21 1. 20 Letf:R-oR be defined by f)-x3 +8, then fis a.ane-to-ane anly 1b.onta only K. neither one-to-are nor onto d, 6re-to-ane and on to ? 2I f:R->R is giwen by the formula fl) = x2 -4, then f(El;21) = Short Answec; B10] (2)2-4=0 Then Ris: reflerine anly 2An equiralence relatrion K. symmetric only 0. transifive only V 23Lt A = 305610s de fine the relation R on the Pawer Set PA) hy xRY if and only if the subrets X and of A hae the same Aumapr ot elements of A. How many equiralence classes does A/R have ta. 4 d.3