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tensa zangetsu [6.8K]
3 years ago
14

NEED ANSWER NOW..NEED CORRECT ANSWER WILL MARK BRAINLIEST..

Mathematics
2 answers:
ikadub [295]3 years ago
7 0

-1 3/5 - 2 1/15

-1 9/15 - 2 1/15

-3 10/15

-3 2/3 mg/L

Alex73 [517]3 years ago
4 0

-1 3/5 + -2 1/ 15

get a common denominator or 15

 - 1 9/15 + -2 1 /15

-3 10/15

-3 2/3 mg/L

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15 times is the answer
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23 A racing car used 255 litres of fuel to complete a 340 km race. On average, how many litres of fuel did the car use every 100
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255 litres for 340 km
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Determine the rational zeros for the function f(x)=x^3+7x^2+7x-15
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Answer:

1,-3,-5

Step-by-step explanation:

Given:

f(x)=x^3+7x^2+7x-15

Finding all the possible rational zeros of f(x)

p= ±1,±3,±5,±15 (factors of coefficient of last term)

q=±1(factors of coefficient of leading term)

p/q=±1,±3,±5,±15

Now finding the rational zeros using rational root theorem

f(p/q)

f(1)=1+7+7-15

   =0

f(-1)= -1 +7-7-15

     = -16

f(3)=27+7(9)+21-15

    =96

f(-3)= (-3)^3+7(-3)^2+7(-3)-15

     = 0

f(5)=5^3+7(5)^2+7(5)-15

    =320

f(-5)=(-5)^3+7(-5)^2+7(-5)-15

      =0    

f(15)=(15)^3+7(15)^2+7(15)-15

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f(-15)=(-15)^3+7(-15)^2+7(-15)-15

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3 years ago
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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:

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(c)

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

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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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