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4 years ago

10

307 round to nearest tens

2 answers:

Irina-Kira [14]4 years ago

5 0

310 is 307 rounded to the nearest tens place

Allushta [10]4 years ago

4 0

310 is the answer to the problem

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4) A piece of hematite contains 70%

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42g

Step-by-step explanation:

70% of 60 = 42

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3 years ago

What is 0.0003840 expressed in scientific notation

neonofarm [45]

You can write the fraction 0.0003840 a number of ways.
0.0003840 = 0.003840/10 = 0.03840/100 = 0.3840/1000 = 3.840/10000

The one we're interested in is the last one, which has one non-zero digit to the left of the decimal point. The power of 10 in the denominator is the 4th power (the number of zeros is 4). 10^4 in the denominator is equivalent to multiplying by 10^(-4) in the numerator.

Expressed in scientific notation,
$0.0003840=3.840 \cdot 10^{-4}$

5 0

3 years ago

Read 2 more answers

How do I solve the length of AC?

Crank

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∆ABC and ∆ADE are similar triangles.

Thus ;

$\frac{AD}{AC} = \frac{DE}{BC} = \frac{AE}{AB} \\$

So :

$\frac{5}{3 + 2x} = \frac{4}{8} \\$

$\frac{5}{3 + 2x} = \frac{1}{2} \\$

Inverse both sides

$\frac{3 + 2x}{5} = \frac{2}{1} \\$

$\frac{2x + 3}{5} = 2 \\$

Multiply sides by 5

$5 \times \frac{2x + 3}{5} = 5 \times 2 \\$

$2x + 3 = 10$

Thus ;

$AC = 2x + 3 = 10$

$AC = 10$

Done...

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7 0

3 years ago