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Alika [10]
3 years ago
6

Help!? me please help mee​

Mathematics
1 answer:
Zanzabum3 years ago
7 0

Answer:

X=7

Step-by-step explanation:

in order to get everything out of the square root, just square both sides.

This will give you x + 1 = 2x - 6

move like terms to each side and you’ll end up with x = 7

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Convert 5.1 to a percentage
krok68 [10]
5.1=510\%
5 0
3 years ago
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How many solutions does the equation 5X +10 equals 5X - 8 have
brilliants [131]

Answer:

zero

Step-by-step explanation:

5x+10 = 5x-8

5x-5x = -8-10

0 = -18

so zero

7 0
3 years ago
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A survey of 2,254 American adults indicates that 17% of cell phone owners browse the internet exclusively on their phone rather
GrogVix [38]

Answer:

We conclude that the proportion of Americans who only use their cell phones to access the internet is different than the Chinese proportion of 38%.

Step-by-step explanation:

We are given that a survey of 2,254 American adults indicates that 17% of cell phone owners browse the internet exclusively on their phone rather than a computer or other device. According to an online article, a report from a mobile research company indicates that 38 percent of Chinese mobile web users only access the internet through their cell phones.

We have to conduct a hypothesis test to determine if these data provide strong evidence that the proportion of Americans who only use their cell phones to access the internet is different than the Chinese proportion of 38%.

<em>Let p = proportion of Americans who only use their cell phones to access the internet</em>

SO, Null Hypothesis, H_0 : p = 38%  {means that the proportion of Americans who only use their cell phones to access the internet is same as that of Chinese proportion of 38%}

Alternate Hypothesis, H_a : p \neq 38%  {means that the proportion of Americans who only use their cell phones to access the internet is different than the Chinese proportion of 38%}

The test statistics that will be used here is <u>One-sample z proportion statistics</u>;

                 T.S. = \frac{\hat p-p}{\sqrt{\frac{\hat p(1- \hat p)}{n} } }  ~ N(0,1)

where, \hat p = proportion of cell phone owners who browse the internet

                 exclusively on their phone in a survey of 2,254 adults = 17%

          n  = sample of adults = 2,254

So, <em><u>test statistics</u></em> = \frac{0.17-0.38}{\sqrt{\frac{0.17(1- 0.17)}{2,254} } }

                            = -26.542

<em>Since in the question we are not given with the significance level so we assume it to be 5%. So, at 0.05 level of significance, the z table gives critical values between -1.96 and 1.96 for two-tailed test. Since our test statistics does not lie in between the critical values of z so we have sufficient evidence to reject null hypothesis as it will fall in the rejection region.</em>

Therefore, we conclude that the proportion of Americans who only use their cell phones to access the internet is different than the Chinese proportion of 38%.

3 0
3 years ago
The sum of two trinomials is 7x2 - 5x + 4. If one of the trinomials is 3x2 + 2x - 1, then what is the other trinomial?
allsm [11]
Total=sum of parts
Total= trinomial 1 + trinomial 2
Also, total - trinomial 1=trinomial 2

7x² - 5x + 4 -(3x² + 2x - 1)=missing trinomial
7x²-5x+4+(-1 )(3x²+2x-1 ) distribution of -1
7x²-5x+4+(-1)(3x²)+(-1)(2x)-(-1)(1)
7x²-5x+4-3x²-2x+1 simplified
7x²-3x²-5x-2x+4+1 commutative
4x²-7x+5 SOLUTION
4 0
3 years ago
Read 2 more answers
Right or Wrong <br> if not please help me
Ghella [55]

Sorry it's wrong the correct answer is 5.

3           5

--    ÷    ----

1            3

cross out the 3's

           5

--    ÷    ----

1            

5 0
3 years ago
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