Answer:
x equals plus or minus square root of 5 minus 1
Step-by-step explanation:
we have

Divide by 2 the coefficient of the x-term

squared the number

Adds both sides


Rewrite as perfect squares

take the square root both sides


therefore
x equals plus or minus square root of 5 minus 1
Answer: <em>a + ( 2a - 7 ) = 41</em>
Explanation:
Let be "a" the Nicci's age and "s" the Nicci's sister.
You know that the sum of Nicci's age and her sister's age is 41. This can be represented with the following equation:
<em>a + 8 = 41</em>
And knowing that Nicci's sister is 7 years less than twice Nicci's age, you can write another equation to represent this:
<em>8 = 2a - 7</em>
Now, substitute the second equation into the first equation in order to find the equation that represents this relationship.
Then, this is:
<em>a + ( 2a - 7 ) = 41</em>
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<em>Hope it helps...</em>

Multiply sides by 7

Plus sides 3x


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And we're done.....♥️♥️♥️♥️♥️
The tabular method is called: cross-tabulation.
<h3>What is Cross-Tabulation?</h3>
- Cross-tabulation, which is also called contingency table or shorten as cross-tab, can be described as a tool in statistics used in analyzing categorical data that involves mutually exclusive values.
- Cross-tabulation is used in analyzing the relationship within a data having two variables, where such relationship are not evident enough.
Therefore, the tabular method is called: cross-tabulation.
Learn more about cross-tabulation on:
brainly.com/question/13298479
So first 3+2=5 then 5×4=20 so your answer is 20