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Varvara68 [4.7K]
3 years ago
11

What is the value 7x^2 + 2x when 3=x

Mathematics
2 answers:
avanturin [10]3 years ago
7 0

Answer:

69.

Step-by-step explanation:

Plug in 3 for x, then simplify.

Hope this helped, please mark Brainliest if it did!

stiks02 [169]3 years ago
4 0

Answer:

69

Step-by-step explanation:

7(3^2)+6

7*9+6

63+6=

69

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Find the number if: 4.5% of it is 23% of 45
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Well, let's say the number is "x", so "x" is the 100%.

now, what the dickens is 23% of 45 anyway?

if we take 45 to be the 100%, what is its 23%?

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
45&100\\
a&23
\end{array}\implies \cfrac{45}{a}=\cfrac{100}{23}\implies \cfrac{45\cdot 23}{100}=a\implies 10.35=a

ok, well, we know then that 4.5% of "x" is 10.35, we also know that "x" is the 100%, what is "x" anyway?

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
x&100\\
10.35&4.5
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Ilia_Sergeevich [38]

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Step-by-step explanation:

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