There are three outcomes of 4 out of eighteen outcomes, so the fraction of angle of spinner numbered 4 is 
What is the product written in scientific notation? (5.91×10−3)⋅(8.7×1010)
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Whenever you can invert a function, you have that the graphs of and its inverse
are reflected with respect to the line
So, given any point on the graph of , you can simply swap its coordinates to get the correspondent point on the original function
As an example, all exponential functions pass through the point , while all the logarithmic functions pass through the point