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Ulleksa [173]
3 years ago
12

At the library you find 9 books on a certain topic. The library and tell you that 55% books on this topic have been signed out h

ow many books does the library have on this topic
Mathematics
2 answers:
nirvana33 [79]3 years ago
5 0
To get the answer we have to find 55% of 9.
First step is rewrite 55% as 0.55
Second and the last step is to multiply 0.55 times 9
0.55*9=4.95~=5 -its the answer
Lostsunrise [7]3 years ago
4 0
Firstly, you should find 10% of 9, which is 0.9 You've then got to multiply this by 5.5, as you've got 55 books. 0.9x5.5= 4.95 Therefore, as you cannot have .95 of a books, this has to be rounded to 5. Therefore, the library has 5 books out on the topic. Hope this helps :)
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3 years ago
Eight sided dice can be described as two square based pyramids stuck together at
kobusy [5.1K]
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V=1/3s³.

This means the total volume is V = 2(1/3s³) = 2(1/3(2³)) = 16/3 = 5.33 mm³.

For the solid gold die, we know that it weighs 0.02g per mm³:

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For the plastic die, plastic weighs 0.01 g per mm³:
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We also need to find the surface area, as it will be painted.  Each face is an equilateral triangle; the area of a triangle is given by the formula

A = 1/2bh

We need to use the Pythagorean theorem to find the height.  The height will be one leg and 1/2 of the base will be the other; the slanted side will be the hypotenuse:

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The difference between it and the cost for the gold die is 4.30 - 0.67 = $3.63.
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