Question 612484
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Hi,re TY, Yes, A is correct choice. 
Find: {{{f^-1(x)}}} 
f(x)=1/2x-2   ||using y for f(x)
 y = x/2 - 2    ||'switching' the y and the x to find the inverse
 x = y/2 - 2
 x + 2 = y/2    || solving for y
 2x+4 = y
{{{f^-1(x)= 2x+4}}}