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Anna35 [415]
3 years ago
13

Please show me how to solve the following problem(-1) ^{2} [-7 ^{2}-(-2) ^{2} ]

Mathematics
1 answer:
Ne4ueva [31]3 years ago
6 0
I will rewrite it (if it's different from your original problem, please let me know:

(-1)²[ -7² - (-2)²] (note that -7² ≠ (-7)². I used the 1st one.

1[-49 +4] = -45
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A metal worker has several 1-kilogram bars of a metal alloy that contain 23% copper and several 1-kilogram bars that contain 79%
astraxan [27]

Answer:

30 each of 23% bars and 18 each of 79% bars

Step-by-step explanation:

If x is the number of 1 kg 23% copper bars, and y is the number of 1 kg 79% copper bars, then:

x + y = 48

0.23x + 0.79y = 0.44(48)

Substituting and solving:

0.23x + 0.79(48-x) = 0.44(48)

0.23x + 37.92 - 0.79x = 21.12

16.8 = 0.56x

x = 30

y = 48 - x

y = 18

You need 30 each of 23% bars and 18 each of 79% bars.

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4 years ago
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levacccp [35]
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Brilliant_brown [7]
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a dust mite is 400 pm long under a microscope, it looks 100,000 pm long. what magnification scale was used​
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Answer: 250:1

Step-by-step explanation:

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