The pH of a particular solution is given by pH = -log(x-2), where x represents the concentration of the hydrogen ions in the
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For this case we can apply the Pythagorean theorem to find "x". Taking the rectangle triangle of base 5 we have:
By definition of power properties we have:
So:
Answer:
To evaluate a function at a given input, you have to substitute every occurrence of the variable with that particular value.
So, for the first function, you have
The name of the variable is obviously irrelelvant, so the same goes for the second function: