3 years ago

Someone help me find x please!

Mathematics

1 answer:

Akimi4 [234]3 years ago

8 0

X is equal to 28 and Y is equal to 23

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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
\end{cases}\implies 21=\cfrac{k(4+3)}{4-3}\implies 21=\cfrac{k(7)}{1}
\\\\\\
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3 years ago

the radius of a circular candle is 5mm. if i want to attach a ribbon to the outside, how much ribbon do i need? (answer choices

Oxana [17]

Answer:

18.84

PLEASE MARK BRAINLIEST!! THX

Step-By-Step EXPLAINATION:

radius: 6 ft

3.14*6=

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Step-by-step explanation:

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