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Anuta_ua [19.1K]
3 years ago
9

Electron is organizing the bookcase in the school library. He makes sure each shelf has 15 books on it. There are 9 shelves of m

ath books and 6 shelves of science books.
Mathematics
1 answer:
Paul [167]3 years ago
6 0

Answer:

Total amount of books in the bookcase =  225 books

Step-by-step explanation:

Each shelf is to have 15 books

Therefore total amount of books in the bookcase = {9×15} + {6×15} = 225 books

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Pls help
KATRIN_1 [288]

Answer:

169.04 in² (nearest hundredth)

Step-by-step explanation:

Surface area of a cone = \pir² + \pirl

(where r = radius of the base and l = slant height)

Given slant height l = 10 and surface area = 188.5

Surface area  = \pir² + \pirl

188.5 = \pir² + 10\pir

\pir² + 10\pir - 188.5 = 0

r = \frac{-10\pi +\sqrt{(10\pi )^2-(4\times\pi \times-188.5)} }{2\pi } = 4.219621117...

Volume of a cone = (1/3)\pir²h

(where r = radius of the base and h = height)

We need to find an expression for h in terms of l using Pythagoras' Theorem a² + b² = c², where a = radius, b = height and c = slant height

r² + h² = l²

h² = l² - r²

h = √(l² - r²)

Therefore, substituting found expression for h:

volume of a cone = (1/3)\pir²√(l² - r²)

Given slant height l = 10 and r = 4.219621117...

volume = 169.0431969... = 169.04 in² (nearest hundredth)

5 0
2 years ago
Read 2 more answers
Bill has 15 fewer cards than joe . write an expression to find how many cards bill has... ???
Ganezh [65]
15 - 1 = x thats the answer to the problem thats how you can have the answer
6 0
2 years ago
Is (6, 2) a solution to this system of equations? x + 4y = 14 2x + 4y = 20
uranmaximum [27]
No it’s not because (6,2) would be a no solution so no
3 0
3 years ago
Which diagram shows parallel lines cut by a transversal? 2 lines are cut by a transversal. At the intersection of the first line
AlekseyPX

Answer:

c.

Step-by-step explanation:

2 lines are cut by a transversal. At the intersection of the first line with the transversal, the bottom right angle is 130 degrees. At the intersection of the second line with the transversal, the uppercase right angle is 50 degrees.

6 0
3 years ago
Read 2 more answers
This is the word problem, "Don and 3 friends share 2 sandwiches at lunch. Which equation can be used to find how much of a sandw
Softa [21]

Answer:

B. X = 2 divided by 4

Step-by-step explanation:

The answer is B because they are sharing the 2 sandwiches so since there is a total of 4 people, you would need to do 2 divided by 4. Hope this helped you. :)

3 0
3 years ago
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