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Mnenie [13.5K]
3 years ago
13

Help pelase i need help

Mathematics
1 answer:
djyliett [7]3 years ago
6 0

Answer:

:P

Step-by-step explanation:

:P

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Brainly gives me so many trust issues, especially when 2 people told you the same answer and you get it wrong GJKEGHG
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Is 0.2857 a rational number?Explain
AfilCa [17]

Answer:

0.2857 is not a rational number.

Step-by-step explanation:

Because rational numbers have to be greater than 1. Decimals are not over 1 so it is not a rational number. Your welcome!

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Laboratory tests show that the lives of light bulbs are normally distributed with a mean of 750 hours and a standard deviation o
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Step-by-step explanation:

5 0
4 years ago
In ΔHIJ, h = 40 cm, ∠J=20° and ∠H=93°. Find the length of j, to the nearest centimeter.
DaniilM [7]

Given:

In ΔHIJ, h = 40 cm, ∠J=20° and ∠H=93°.

To find:

The length of j, to the nearest centimeter.

Solution:

According to Law of sine,

\dfrac{a}{\sin A}=\dfrac{b}{\sin B}=\dfrac{c}{\sin C}

In ΔHIJ, using law of sine, we get

\dfrac{j}{\sin J}=\dfrac{h}{\sin H}

\dfrac{j}{\sin (20^\circ)}=\dfrac{40}{\sin (93^\circ)}}

j=\dfrac{40\times \sin (20^\circ)}{\sin (93^\circ)}}

On further simplification, we get

j=\dfrac{40\times 0.34202}{0.99863}

j=\dfrac{13.6808}{0.99863}

j=13.69958

Approximate the value to the nearest centimeter.

j\approx 14

Therefore, the length of j is 14 cm.

7 0
3 years ago
Is 21.5 x 10^3 in scientific notation ? explain
Leya [2.2K]

Answer:

2.15 x 10^4

Step-by-step explanation:

since 21.5 is not between 1 and 10 we have to divide 21.5 by 10 which is 2.15 but now we have to x 10 to 10^3 which is 10^4

plz  mark as brainliest


7 0
3 years ago
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