Answer:
Associative.
Step-by-step explanation:
In addition and multiplication, it does not matter which two numbers you put together first. On the left aide 6 is associated with 3. On the right side 3 is grouped with 7. It doesn't matter where 3 goes. You still get the same answer.
(6 + 3) + 7 = 6 + (3 + 7)
9 + 7 = 6 + 10
16 = 16
Answer:
The LCM of 18 and 21 is 126.
Let
x---------> the thickness of the frame in feet
At-------> Area of the mirror and the frame in square feet
we know that
------> equation ![1](https://tex.z-dn.net/?f=%201%20)
--------> equation ![2](https://tex.z-dn.net/?f=%202%20)
equate equation
and equation ![2](https://tex.z-dn.net/?f=%202%20)
![19.25=4x^{2} +16x+15\\ 4x^{2} +16x+15-19.25=0\\ 4x^{2} +16x-4.25=0](https://tex.z-dn.net/?f=%2019.25%3D4x%5E%7B2%7D%20%2B16x%2B15%5C%5C%204x%5E%7B2%7D%20%2B16x%2B15-19.25%3D0%5C%5C%204x%5E%7B2%7D%20%2B16x-4.25%3D0%20)
therefore
the answer is the option
![C. 4x2 + 16x - 4.25 = 0](https://tex.z-dn.net/?f=%20C.%204x2%20%2B%2016x%20-%204.25%20%3D%200%20)
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