For this case, the first thing we must do is define a variable.
We have then:
x: unknown number
We now write the equation that models the problem:
From here, we clear the value of x.
We multiply both sides of the equation by 2:
We subtract 30 on both sides of the equation:
Answer:
The value of the unknown number is given by:
There are 2 ways you can write this.
You can either do /1 or /100
The most used is
1/5 i hope it helps. We knows this because 20 times 5 is 100. 5 times 2 is 10.
The answer would be 7y+35
now, what is the value of the derivative at any extrema on the original function? well, by definition, if the original function has an extrema anywhere, the derivative will be the derivative of a horizontal tangent line to it, and by definition it'll be 0.
