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vlabodo [156]
3 years ago
8

What is 30% of 70? Please help.

Mathematics
2 answers:
solmaris [256]3 years ago
4 0
70/x=100/30
x(70/x)=(100/30)x
70=3.33x
x=70/3.33
x=21
garik1379 [7]3 years ago
3 0
Hi lovely,

The answer you're looking for is 21.
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The sum of all lengths of polygon
alexdok [17]
I think the answer is The perimeter!
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3 years ago
The LB Company has long manufactured a light bulb with an average life of 5400 hours. Company researchers have recently develope
elena55 [62]
<h2><u>Answer with explanation</u>:</h2>

Let \mu be the average life of light bulbs.

As per given , we have

Null hypothesis : H_0 : \mu =5400

Alternative hypothesis : H_a : \mu >5400

Since H_a is right-tailed and population standard deviation is also known, so we perform right-tailed z-test.

Formula for Test statistic : z=\dfrac{\overlien{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

where, n= sample size

\overline{x}= sample mean

\mu= Population mean

\sigma=population standard deviation

For n=95,\ \overline{x}=5483\ \&\ \sigma=500, we have

z=\dfrac{5483-5400}{\dfrac{500}{\sqrt{95}}}=1.61796786124\approx1.6180

Using z-value table , Critical one-tailed test value for 0.06 significance level :

z_{0.06}=1.5548

 Decision : Since critical z value (1.5548) < test statistic (1.6180), so we reject the null hypothesis .

[We reject the null hypothesis when critical value is less than the test statistic value .]

Conclusion : We have enough evidence at 0.06 significance level to support the claim that the new filament yields a longer bulb life

8 0
3 years ago
(4.2 X 10 Power of four) X (2 x 10 Power of three)
SashulF [63]

Answer:

(4.2 X 10,000) X (2 X 1,000)

42,000 X 2,000= 84,000,000

Step-by-step explanation:

Hope this helps

3 0
3 years ago
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I really need help guys idk how to do it
melomori [17]

Answer:

Jonah. Five million is a much higher number than 152,000. To put it mathematically -----> 5,000,000 > 152,000.

Step-by-step explanation:

7 0
3 years ago
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Round the decimal to the nearest hundredth: 5.6192
Drupady [299]
Rounding 5.6192 -

First you look at the hundredth place: If the number is 5 and higher round it up, if its 4 and lower round down. In this case 1 is in the hundredth place which means you round down. So 5.6192 rounded is 5.6

Answer: 5.6 or 5.60
8 0
3 years ago
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