Answer:
Cscscscbsc s
Step-by-step explanation:
Csucbhscucbhsbhczj
We can simplify across between the 5 and the 50 and also between the 42 and the 3.
N.b., this is copied from an answer I wrote for someone else.Thinking about the graph of y, the rate of change is zero whenever there is an extremum.
First, differentiate y.

Next, find the zeros of y' by factoring.

Now, we substitute these x-values into the
original equation to find the coordinates.
28 each book 155-15=140 and then 140÷5=28