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garik1379 [7]
3 years ago
15

I have a brain and I know most of you are using brainly to cheat in school

Mathematics
1 answer:
maxonik [38]3 years ago
5 0
Brainly should be used to ask questions and get answers. But you still should figure out and practice how to do it.
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In a small library , there are 5 nonfiction books for every 9 fiction books There are 130 a . How many fiction books are there ?
Mice21 [21]

Answer: 234

Step-by-step explanation:

If there are 130 nonfiction books, then there are 234 fiction books

6 0
3 years ago
A chemist has two alloys, one of which is 15% gold and 20% lead and the other which is 30% gold and 50% lead. How many grams of
vlabodo [156]

Answer: 490 grams of the first alloy should be used.

30 grams of the second alloy should be used.

Step-by-step explanation:

Let x represent the weight of the first alloy in grams that should be used.

Let y represent the weight of the second alloy in grams that should be used.

A chemist has two alloys, one of which is 15% gold and 20% lead. This means that the amount of gold and lead in the first alloy is

0.15x and 0.2x

The second alloy contains 30% gold and 50% lead. This means that the amount of gold and lead in the second alloy is

0.3y and 0.5y

If the alloy to be made contains 82.5 g of gold, it means that

0.15x + 0.3y = 82.5 - - - - - - - - - - - -1

The second alloy would also contain 113 g of lead. This means that

0.2x + 0.5y = 113 - - - - - - - - - - - - -2

Multiplying equation 1 by 0.2 and equation 2 by 0.15, it becomes

0.03x + 0.06y = 16.5

0.03x + 0.075y = 16.95

Subtracting, it becomes

- 0.015y = - 0.45

y = - 0.45/- 0.015

y = 30

Substituting y = 30 into equation 1, it becomes

0.15x + 0.3 × 30 = 82.5

0.15x + 9 = 82.5

0.15x = 82.5 - 9 = 73.5

x = 73.5/0.15

x = 490

6 0
3 years ago
The volume for a rectangular prism is given by the formula V = l · w · h, where l is the length of the prism, w is the width of
Charra [1.4K]

Answer:

4

Step-by-step explanation:

devide 144 by 9

get 16

The base squared is 16

find the root of 16

get 4

4 is your awnser

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3 years ago
How many solutions does 2x + 3y = -6 and <br><br> 3x - 4y = -12 have
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As there are 2 equations and two unknowns there is 1 solution

8 0
3 years ago
47,258 redondear el decimal hasta la centésima más próxima ​
KIM [24]

Answer:

I don't speak Spanish

Step-by-step explanation:

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2 years ago
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