Melody

I'm pretty sure it is just swapping the x for the y

so  f^-1(1) = value of x when y is 1  answer  2

etc.  So I end up with 3

You can get the solution graphically.  It is an estimate of course.

x= 4.636

Thanks Alan and Hugo. 

\(x+ln(x+6) = 7\\ ln(x+6) = 7-x\\ e^{ln(x+6)} = e^{7-x}\\ x+6 = \frac{e^{7}}{e^x}\\ \frac{1}{x+6} = \frac{e^x}{e^{7}}\\ e^{7}= e^x(x+6)\\\)

mmm     That didn't help at all.   

Yes that is great.    

x=45

So angle DAB=90  and you know that angle ABC=90

So pow can you use that to determine if  AD and BC are parallel?

Please show me your answer, with working , for part a

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