3 years ago

How long will it take for $3000 to grow to $7000 if it is deposited in an account earning 7% interest?

Mathematics

1 answer:

Elena-2011 [213]3 years ago

7 0

The answer is about 13 years

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suppose y varies directly with x, and y = 8 when x = -6. what direct variation equation relates x and y? what is the value of y

Kisachek [45]

$\bf \qquad \qquad \textit{direct proportional variation}\\\\
\textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\
\textit{we also know that }
\begin{cases}
y=8\\
x=-6
\end{cases}\implies 8=k(-6)\implies \cfrac{8}{-6}=k
\\\\\\
-\cfrac{4}{3}=k\qquad therefore\qquad \boxed{y=-\cfrac{4}{3}x}
\\\\\\
\textit{when x = -2, what is \underline{y}?}\qquad y=-\cfrac{4}{3}(-2)$