Answer:
6
Step-by-step explanation:
Answer:
9.13385827
Step-by-step explanation:
For the given quadratic equation we only have a maximum at y = 18.
<h3>
How to find the extrema of the given function?</h3>
Here we have:

Notice that this is a quadratic equation of negative leading coefficient.
Then we have a maximum at the vertex, and both arms tend to negative infinity as x tends to infinity or negative infinity.
The vertex is at:
x = -(-4)/(2*(-2)) = -1
The maximum is:

If you want to learn more about quadratic equations:
brainly.com/question/1214333
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From the given question:

The probability of a normally distributed data between two values (a, b) is given by:

Thus,
What you need to do is add the sale price to the $35 dollars and that will give you the original coat of the phone