Mathematics: Ihave this grade 9 fractions question, (-4•1/2)^2 (25/4)^2

Ihave this grade 9 fractions question, (-4•1/2)^2

Ответ:

kaylahill14211

12.03.2022

$\bf ~\hspace{7em}\textit{negative exponents}
\\\\
a^{-n} \implies \cfrac{1}{a^n}
~\hspace{4.5em}
a^n\implies \cfrac{1}{a^{-n}}
~\hspace{4.5em}
\cfrac{a^n}{a^m}\implies a^na^{-m}\implies a^{n-m}
\\\\[-0.35em]
\rule{34em}{0.25pt}$

$\bf \left( -4\cdot \cfrac{1}{2} \right)^2\left( \cfrac{25}{4} \right)^2\implies \stackrel{\mathbb{PEMDAS}}{\left( -2 \right)^2\left( \cfrac{25^2}{4^2} \right)}\implies (-2)(-2)\cdot \cfrac{625}{(2^2)^2}\implies 2^2\cdot \cfrac{625}{2^{2\cdot 2}}
\\\\\\
\cfrac{2^2\cdot 625}{2^4}\implies \cfrac{625}{2^{-2}\cdot 2^4}\implies \cfrac{625}{2^{-2+4}}\implies \cfrac{625}{2^2}\implies \cfrac{625}{4}\implies 156\frac{1}{4}$

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Ответ:

naruto63

23.01.2023

Mathematics

Solution :

According to the question PC magazine conducted a survey and asked its readers to participate their satisfaction with the different brands of the electronic item. Around 9000 readers rated the product from scale 1 to 10.

SO we have to identify the following regarding the survey :

a. identifying the population

-- all the readers of the PC magazine

b. identifying the parameters of the interests

-- the population mean that rated the digital camera

c. identifying the sampling frame

--- all the readers

d. identifying the sample size

-- unknown

e. identifying the sampling design

-- voluntary response

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Ihave this grade 9 fractions question, (-4•1/2)^2 (25/4)^2

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