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Alexeev081 [22]
2 years ago
8

I only need #16 this Test/homework is hard. Help

Mathematics
1 answer:
Amiraneli [1.4K]2 years ago
8 0

Answer:

d

Step-by-step explanation:

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A metalworker has a metal alloy that is 15​% copper and another alloy that is 60​% copper. How many kilograms of each alloy shou
coldgirl [10]

18 kg of 15% copper and 72 kg of 60% copper should be combined by the metalworker to create 90 kg of 51% copper alloy.

<u>Step-by-step explanation:</u>

Let x = kg of 15% copper alloy

Let y = kg of 60% copper alloy

Since we need to create 90 kg of alloy we know:

x + y = 90

51% of 90 kg = 45.9 kg of copper

So we're interested in creating 45.9 kg of copper

We need some amount of 15% copper and some amount of 60% copper to create 45.9 kg of copper:

0.15x + 0.60y = 45.9

but

x + y = 90

x= 90 - y

substituting that value in for x

0.15(90 - y) + 0.60y = 45.9

13.5 - 0.15y + 0.60y = 45.9

0.45y = 32.4

y = 72

Substituting this y value to solve for x gives:

x + y = 90

x= 90-72

x=18

Therefore, in order to create 90kg of 51% alloy, we'd need 18 kg of 15% copper and 72 kg of 60% copper.

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2 years ago
Combine the rational expressions into a single fraction and reduce it in the lowest terms.
Lostsunrise [7]

Answer:

13. -3                14. (x+1)(2x-7) / (x-6)(x+3)

Step-by-step explanation:

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Hi!

Step-by-step explanation:

How are you?

8 0
3 years ago
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A submarine descends to a depth of 660 feet below the surface in 11 minutes. At this rate, what integer represents the change, i
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13 minutesStep-by-step explanation:

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Answer:

Step-by-step explanation:

Chicken fajita = 3.50

Juice = 1.50

1.5+3.5=5

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3 years ago
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