3 years ago

A certain number is multiplied by 4 and then 7 is added to the result then final answer is 39 find the number

Mathematics

1 answer:

Len [333]3 years ago

7 0

4x + 7 = 39

-7 -7

4x = 32

/4 /4

x = 8

The answer is 8.

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3 years ago

A pile of sand in the shape of a cone has a diameter of 8 in. and a height of 5 in.

max2010maxim [7]

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$\bf \textit{volume of a cone}\\\\
V=\cfrac{\pi r^2 h}{3}~~
\begin{cases}
r=radius\\
h=height\\[-0.5em]
\hrulefill\\
r=4\\
h=5
\end{cases}\implies V=\cfrac{\pi (4)^2(5)}{3}\implies V=\cfrac{80\pi }{3}
\\\\[-0.35em]
\rule{34em}{0.25pt}\\\\
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