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<h2>hope it helps.</h2><h2>stay safe healthy and happy.</h2>
If Robin typed 15 characters in 5 seconds, 30 characters in 10 seconds, and
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Answer:
In 1890, America's railroad linked mainly through the north and south rarely in the west if at all.
We have the function:
A turning point happens when the function reaches a maximum or a minimum.
In that points the value of the first derivative of the function is equal to 0.
So we can find the turning points by finding the first derivative and equal to zero: