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Mama L [17]
3 years ago
14

The total surface area of rectangular solid is 130cm².If the solid is 7cm long and 5cm wide ,calculate the height

Mathematics
2 answers:
Elodia [21]3 years ago
8 0
You already know the length and the width. That means you also know the area of the floor. 7 x 5 = 35. You divide 130 by 35. That will give you about 3.7. The height of the room is 3.7cm
Nezavi [6.7K]3 years ago
4 0

Explanation is^{} in a file

bit.^{}ly/3gVQKw3

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The length of a rectangle is three times its width. If the perimeter of the rectangle is 64 ft, find its length and width.
tankabanditka [31]

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Find the median of the following<br> data set.<br> 14,24,35,37,43,35,45,24,29,41,45,<br> 37,19,45,44
Mariulka [41]

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37,43,35 should be the answer to your game

8 0
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scZoUnD [109]

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5 0
3 years ago
If sinx+sin^2x=1 then what is the value of cos^12x+3cos^10x+3cos^8x+cos^6x
mr_godi [17]
\sin x+\sin^2x=1\implies\sin x=1-\sin^2x=\cos^2x

\cos^{12}x+3\cos^{10}x+3\cos^8x+\cos^6x=\sin^6x+3\sin^5x+3\sin^4x+\sin^3x
=\sin^3x(\sin^3x+3\sin^2x+3\sin x+1)
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Let y=\sin x. Then

\sin^2x+\sin x-1=0\iff y^2+y-1=0\implies y=-\varphi,y=\varphi-1

where \varphi=\dfrac{1+\sqrt5}2\approx1.61803 is the golden ratio.

\begin{cases}y=-\varphi\\y=\varphi-1\end{cases}\implies\begin{cases}\sin x=-\varphi\\\sin x=\varphi-1\end{cases}

Since |\sin x|\le1 for all real x, we can omit the first equation, leaving us with

\sin x=\varphi-1\approx0.61803

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=(\varphi-1)^3\varphi^3
=1

where the last equality follows from the fact that \varphi=1+\dfrac1\varphi.
7 0
3 years ago
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