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elixir [45]
3 years ago
14

An atom of silicon is approximately 0.00000000025 meters wide. How do you express that number in scientific notation? O 25 10-10

meters O 2.5 × 10-11 meters O 2.5 1010 meters O 2.5 x 10-10 meters​
Mathematics
1 answer:
garik1379 [7]3 years ago
8 0

Answer:

mohydty868788

Step-by-step explanation:

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86= 10x + 26, what is x?
pashok25 [27]

Answer:

60 = 10x \\ x = 6

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3 years ago
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What is the answer? A B C D
Ilya [14]

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b

Step-by-step explanation:

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Isaiah has $7.15 in Dimes and Nickels. He has a total of 91 coins. How many of each coin does he have? Group of answer choices d
yarga [219]

Answer:

Dimes = x = 52

Nickels = y = 39

Step-by-step explanation:

Let

Dimes = x

Nickels = y

x + y = 91 (1)

0.10x + 0.05y = 7.15 (2)

From (1)

x = 91 - y

Substitute x = 91 - y into (2)

0.10x + 0.05y = 7.15

0.10(91 - y) + 0.05y = 7.15

9.10 - 0.10y + 0.05y = 7.15

- 0.10y + 0.05y = 7.15 - 9.10

-0.05y = -1.95

y = -1.95 / 0.05

= 39

Substitute y = 39 into (1)

x + y = 91

x + 39 = 91

x = 91 - 39

x = 52

Dimes = x = 52

Nickels = y = 39

7 0
3 years ago
Investment of 1000 at 16% interest rate for 20 years
andreev551 [17]
This might be wrong but, 320.

I used the formula for simple interest which is I=Prt, thus giving me this:

I = 1000 (.016) (20)

Hope this helps at all!
7 0
3 years ago
If y varies directly as x, and the constant is -3, what is the equation?
vladimir1956 [14]

Answer:

y = -3x

Explanation:

k = -3

y ¤ x......where ¤ represents the Greek alpha sign

y = k • x

y = -3 • x

y = -3x

5 0
3 years ago
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