3 years ago

The mean temperature for the first 4 days in January was 8°C.

Mathematics

1 answer:

aliya0001 [1]3 years ago

4 0

Answer:

-2°C

Step-by-step explanation:

Sum of 4 days: 4 × 8 = 32

Sum of 5 days: 5 × 6 = 30

5th day: 30 - 32 = -2

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3 years ago

Y is directly proportional to x,and y=216 when x=2. Find y when x=7.

makkiz [27]

$\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=216\\
x=2
\end{cases}\implies 216=k2\implies \cfrac{216}{2}=k
\\\\\\
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\\\\\\
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The cost of 16 television sets is $640,160. What is the cost of 1 television set? (Round off the amount to the nearest thousand

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Answer:

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Step-by-step explanation:

640160≈640000

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