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3 years ago

A pay phone at a shopping mall charges $0.68 for the first four minutes and $0.21 for each extra minute (or part of a minute).

Mathematics

1 answer:

mezya [45]3 years ago

3 0

answer:

2.78 dollars

step-by-step explanation:

hello there!

first we multiply 10 to $ 0.21 ( we got the number 10 from the extra 10 minutes after the first 4 minutes )

10 + $ 0.21

= 2.10 dollars

then we need to add $ 0.68 to $ 2.10 dollars

$ 0.68 + $ 2.10

= 2.78 dollars

2.78 dollars is how much it costs for a 13.44 minute call!

i hope this helps you and please tell if there was a mistake in this, have a wonderful day! <3

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3 years ago

Suppose that x=6 and y=8. If y is inversely related to x, what is y when x=3?

andrey2020 [161]

$\bf \qquad \qquad \textit{inverse proportional variation}\\\\
\textit{\underline{y} varies inversely with \underline{x}}\qquad \qquad y=\cfrac{k}{x}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\
\textit{we also know that }
\begin{cases}
x=6\\
y=8
\end{cases}\implies 8=\cfrac{k}{6}\implies 48=k
\\\\\\
therefore\qquad \boxed{y=\cfrac{48}{x}}
\\\\\\
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3 years ago

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