Answer:
x=-3, y=-6. (-3, -6).
Step-by-step explanation:
-4x+y=6
-5x-y=21
--------------
-9x=27
x=27/-9
x=-3
-5(-3)-y=21
15-y=21
y=15-21
y=-6
Y= 3(3)–2(3)2+5(3)3
y= 9–2*3*2+5*9
y=9–12+5*9
y=9–12+45
y=42
Answer: 4.24264069
Step-by-step explanation: I think you mean the square root?
The domain of the function is all real numbers, the range of a function is y ≤ 4
<h3>What is a function?</h3>
It is defined as a special type of relationship, and they have a predefined domain and range according to the function every value in the domain is related to exactly one value in the range.
We have a function:
f(x) = –(x + 6)(x + 2)
If we plot this function on the coordinate plane, we will see it is a graph of a quadratic function.
Here the no other details are given.
But we can say:
- The domain of the function is all real numbers.
- The range of a function is y ≤ 4
- The x-axis intercept will be at (-6, 0) and (-2, 0).
Thus, the domain of the function is all real numbers, the range of a function is y ≤ 4
Learn more about the function here:
brainly.com/question/5245372
#SPJ1
Answer:
6 km
Step-by-step explanation:
You use Pythagoras
![{QN}^2 = (PN)^{2}+(PQ)^{2} \\PQ = \sqrt{(QN)^{2}-(PN)^{2} }\\ PQ = 6 km](https://tex.z-dn.net/?f=%7BQN%7D%5E2%20%3D%20%28PN%29%5E%7B2%7D%2B%28PQ%29%5E%7B2%7D%20%5C%5CPQ%20%3D%20%5Csqrt%7B%28QN%29%5E%7B2%7D-%28PN%29%5E%7B2%7D%20%20%7D%5C%5C%20PQ%20%3D%206%20km)