4 years ago

How do you write 0.000081 in scientific notation?

Mathematics

1 answer:

Alex73 [517]4 years ago

6 0

Scientific notation: 8.1x10^-5

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A single gram of a certain metallic substance has 0.52 g of copper and 0.25 g of zinc the remaining portion of the substance is

andrezito [222]

Ben's estimate gives 7 g of nickel; the actual amount is 8.03 g.

In 1 g of the substance, there is 0.52 g of copper and 0.25 g of zinc; this gives
0.52+0.25 = 0.77 g of the substance.

The remaining part of the substance is nickel:
1-0.77 = 0.23 g of nickel.

Using Ben's estimate, 0.2 g of nickel per gram of substance, we have
0.2(35) = 7 g of nickel in 35 g of the substance.

The actual amount is 0.23(35) = 8.03 g of nickel in 35 g of the substance.

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3 years ago

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Angelina_Jolie [31]

Answer:

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Step-by-step explanation:

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3 years ago

How many solutions does the equation 3n + 5 (n-4) = 9n -5 have

Tju [1.3M]

$3n + 5(n - 4) = 9n - 5 \\ \\ 3n + 5n - 20 = 9n - 5 \\ \\ 8n - 20 = 9n - 5 \\ \\ 8n - 9n = - 5 + 20 \\ \\ - n = 15 \\ \\ n = - 15$