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Aleonysh [2.5K]
2 years ago
9

Julie has 50$ which is eight dollars more than twice what john has. How much does john have

Mathematics
2 answers:
Kryger [21]2 years ago
4 0
First,Julie has 50 dollars,that’s 8 more than twice what John has.So John must have 50-8 divided by 2.We do 50-8 first because we are not using bedlam’s for this question.50-8 is 42.42 divided by 2 is 21.So John must have 21 dollars.



Checking:
21x2 is 42.42+8 is 50
nydimaria [60]2 years ago
3 0

Answer:

John has $21.

Step-by-step explanation:

Let John's "wealth" be w.  Then 2w+8 = 50, or 2w = 42, or w = 21.

John has $21.  Eight more than twice this is 42+8 = 50, as expected.

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He needs to check his work more, and stop asking middle schoolers to do his cooking math.

Step-by-step explanation:

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A researcher records the amount of time (in minutes) that parent child pairs spend on social networking sites to test whether th
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Answer:

(a) A matched pair design is used to perform the test.

(b) Each sample is of size 30.

(c) The null hypothesis is rejected.

(d) The effect size of the test is medium.

Step-by-step explanation:

A statistical experiment is performed to determine whether the amount of time (in minutes) that parent-child pairs spend on social networking sites to test show any generational differences.

<u>Given</u>:

MD = -42 minutes

t₍₂₉₎ = 4.021

p < 0.05

d = 0.49

The hypothesis is:

<em>H₀</em>: There is no difference between the means, i.e. <em>μ₁</em> = <em>μ₂</em>.

<em>Hₐ</em>: There is a significant difference between the means, i.e. <em>μ₁</em> ≠ <em>μ₂</em>.

(a)

A matched pair design is used to perform the test.

In a matched pair design the participant of the two groups are related in some way. For example, the same sample is tested before and after applying the treatment.

In this case the matched are pairs are of children and their parents. And the treatment is the amount of time spent on social networking sites.

(b)

The degrees of freedom of a matched pair design is:

df = n - 1

29 = n - 1

n = 29 + 1

n = 30

Thus, each sample is of size 30.

(c)

The <em>p</em>-value of the test statistic is < 0.05.

If the <em>p</em>-value is less than the significance level <em>α </em>(say, 0.05) then the null hypothesis is rejected and vise-versa.

Since <em>p</em> < 0.05 the null hypothesis is rejected concluding that there is a significant difference between the amount of time spent on social networking sites by parents and children.

(d)

The estimated value of Cohen's d is, <em>d</em> = 0.49.

A Cohen's d value between the range 0.50 to 0.80 is considered as medium.

Thus, the effect size of the test is medium.

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3 years ago
The function f(x) = 5 1/5^x
aleksklad [387]

Answer: -5 1/5^x

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7 0
3 years ago
What is the equation of a line with points (16,-4) and (-32-10) Oy - 4= 1 (x - 16) Oy+4= 1 (x – 16) Oy - 10 = 3 (x – 32) O y + 1
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Answer:

  • D. y + 10 = 1/8* (x + 32)

Step-by-step explanation:

Use the given points to work out the equation of the line.

<u>Find the slope:</u>

  • m = (- 10 - (-4)) / (- 32 - 16) = - 6 / - 48 = 1/8

<u>Use (-32, - 10) and point- slope form:</u>

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Correct choice is D

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384
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5384
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