Answer:
the only one that is a function is B
Step-by-step explanation:
the rest of them have repeating inputs which makes them no functions
Answer:
1
Step-by-step explanation:
To solve quadratics, the most correct and effective way, in my opinion, is the quadratic formula:
![{\displaystyle x={\frac {-b\pm {\sqrt {b^{2}-4ac}}}{2a}}.}](https://tex.z-dn.net/?f=%7B%5Cdisplaystyle%20x%3D%7B%5Cfrac%20%7B-b%5Cpm%20%7B%5Csqrt%20%7Bb%5E%7B2%7D-4ac%7D%7D%7D%7B2a%7D%7D.%7D%20)
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Plugging it in, we get:
</span></span>
![\frac{-4\pm \sqrt{16+72} }{12} = \frac{-4\pm 2\sqrt{22}}{12} = \frac{-2\pm \sqrt{22} }{6}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-4%5Cpm%20%5Csqrt%7B16%2B72%7D%20%7D%7B12%7D%20%20%3D%20%20%5Cfrac%7B-4%5Cpm%202%5Csqrt%7B22%7D%7D%7B12%7D%20%3D%20%20%5Cfrac%7B-2%5Cpm%20%5Csqrt%7B22%7D%20%7D%7B6%7D%20%20)
So the final answer is:
![\frac{ \sqrt{22}-2 }{6}](https://tex.z-dn.net/?f=%20%5Cfrac%7B%20%5Csqrt%7B22%7D-2%20%7D%7B6%7D%20)
and
Answer:
length: 10 ft; width: 7 ft.
Step-by-step explanation:
Factorizations of 70 are ...
70 = 1·70 = 2·35 = 5·14 = 7·10
The last pair of numbers has the relation that 2·7 -10 = 4, so the numbers 7 and 10 can be used for width and length.
The length is 10 ft; the width is 7 ft.