Melody

Yes how big are the rectangles and how big is the grid?

Nothing because there is no x or y 

Hi Tetration

What does double factorial mean ?

4.9 t^2+25 sin(30)

$$\\=4.9 t^2+25\times 0.5 \\
=4.9 t^2+12.5 \\$$

i entered that as   log(6,10)

$${{log}}_{{\mathtt{10}}}{\left({\mathtt{6}}\right)} = {\mathtt{0.778\: \!151\: \!250\: \!383\: \!643\: \!5}}$$               

Continued here

Yes i am happy with my answer I think.   

I have played with the graph some more as well and I am totally happy.

I am sticking with my first answer - I think that the algebra is correct

My original graph had the wrong coefficients so it was incorrect ***

This graph is correct and it shows that there are no values for      $$f^{-1}(6)$$

$$\int\frac{1}{x}dx$$

If x is positive we both agree that the answer is ln(x) +c

 If x is negative the answer should be    -ln(-x)+c    OR     -ln|x|+c       shouldn't it ?

Hi Geno,

why have you used     ln|u|     instead of   ln(u)   ?