Answer:
A. Wavelength
Step-by-step explanation:
I calculated it logically
<h2><u>Given</u></h2>
![- 5c + 9c = - 20](https://tex.z-dn.net/?f=%20-%205c%20%2B%209c%20%3D%20%20-%2020)
<h2><u>To </u><u>Find</u></h2>
Value of c term
<h2><u>Solution</u></h2>
![- 5 + 9c = - 20 \\ \\ = > 4c = - 20 \\ \\ = > c = \frac{ - 20}{4} \\ \\ = > c = \cancel \frac{ - 20}{4} \\ \\ = > c = - 5](https://tex.z-dn.net/?f=%20-%205%20%2B%209c%20%3D%20%20-%2020%20%5C%5C%20%20%5C%5C%20%20%3D%20%20%3E%204c%20%3D%20%20-%2020%20%5C%5C%20%20%5C%5C%20%20%3D%20%20%3E%20c%20%3D%20%20%5Cfrac%7B%20-%2020%7D%7B4%7D%20%20%5C%5C%20%20%5C%5C%20%20%3D%20%20%3E%20c%20%3D%20%5Ccancel%20%5Cfrac%7B%20-%2020%7D%7B4%7D%20%5C%5C%20%20%5C%5C%20%20%3D%20%20%3E%20c%20%3D%20%20-%205)
<h3>Hope This Helps</h3>
The answer is 990 feet I just did the problem
Part 1) The equation of a circle is (x+4)²+(y−5)²<span>=121.
What is the center and radius of the circle?
we know that
the equation of a circle is of the form
(x-h)</span>²+(y-k)²=r²
in the problem
(x+4)²+(y−5)²=121.------> (x+4)²+(y−5)²=11²
the center (h,k) is the point (-4,5) and the radius is 11
Part 2) we have that
(x+15)²+(y−12)²=25-------> (x+15)²+(y−12)²=5²
we know that
<span>the greatest distance, in feet, a person could be from the lamp and be detected is the radius
</span>
the radius is equal to 5 ft
the answer Part 2) is 5 ft
Part 3) we have that
(x−9)²+(y+11)²=16--------> (x−9)²+(y+11)²=4²
the radius is equal to 4 m
so the diameter is ------> 4*2-----> 8 m
the answer Part 3) is
8 m
Answer:
Music artist
Why:
Well, if this wasn't the question please explain to me what I'm answering!