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2 years ago

6

Identify which of the following are rational numbers. A. −5 B. √12 C. 4 3 ⁄ D. 0.523523 … E. 4.1389467 … F. √25 16 ⁄ G. 27 H. 9.

7

1 answer:

Gennadij [26K]2 years ago

5 0

A. C. D. F. G. H. That is the answers

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If y varies directly as (x+3) and inversely as (x-3) and y=21 when x=4, what is the equation for y in terms of x?

igor_vitrenko [27]

$\bf \qquad \qquad \textit{double proportional variation}
\\\\
\begin{array}{llll}
\textit{\underline{y} varies directly with \underline{x}}\\
\textit{and inversely with \underline{z}}
\end{array}\implies y=\cfrac{kx}{z}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\$

$\bf \textit{\underline{y} varies directly as (x+3) and inversely as (x-3)}\implies y=\cfrac{k(x+3)}{x-3}
\\\\\\
\textit{we also know that }
\begin{cases}
y=21\\
x=4
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\\\\\\
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3 years ago

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