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aleksandr82 [10.1K]
3 years ago
15

Can someone please help me ..I can’t get anymore questions wrong or else I will fail I need help

Mathematics
2 answers:
dedylja [7]3 years ago
5 0

Answer:

maybe number 2

Step-by-step explanation:

because if 2+k=18 then there is no other k there and where did the additional 2 come from ?and 2k=18 then value of k is 9 + there is balance.I may be wrong correct me but i think it is no.2

andrey2020 [161]3 years ago
3 0

Answer:

2k = 18

k = 9

Step-by-step explanation:

First we have to look at each side of the hanger.

There are 2 <em>k</em>'s, which can be represented as "2 times the value of <em>k</em>" or <em>2k</em>.

On the other side, we have the value of 18. The question states that the two sides are balanced. Therefore, the correct equation that represents the image is:

2k = 18.

To find the value of <em>k</em> that makes the equation true, we must isolate the variable <em>k</em>. To do this, we divide 2 from each side of the equation.

2k ÷ 2 = 18 ÷ 2

k = 9.

The value of <em>k </em>that makes the equation true is 9.

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Please answer the question below ​
Hatshy [7]

Answer:

g

Step-by-step explanation:

The maximum value occurs at gradient 0 (the stationary point).

In f this has a value (y) of 6.

In the equation example we have to differentiate:

dg(x)/dx = -x + 4

Gradient is 0 so 4 - x = 0 so x = 4

Plug g(4)=our maximum=-(1/2)4^2 + 4(4) + 3 = -8 + 16 + 3 = 11

11 > 6 so g has greater maximum.

7 0
3 years ago
A researcher records the amount of time (in minutes) that parent child pairs spend on social networking sites to test whether th
ki77a [65]

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.

3 0
3 years ago
Multiply (x - 5)(3x + 6) Express the answer in standard form
levacccp [35]

3 { x}^{2}  - 9x - 30
Work in image above.

7 0
3 years ago
Calculate the GPA of a student with the following grades: B (1616 hours), D (77 hours), C (2121 hours). Note that an A is equiva
adell [148]

Answer:

  2.20

Step-by-step explanation:

The GPA is the weighted average of the grade points. The weights are the number of course hours.

  ((16 hours)(3.0) +(7 hours)(1.0) +(21 hours)(2.0))/((16 +7 +21) hours)

  = 97/44 ≈2.20 . . . . GPA

4 0
3 years ago
You take out a bagel and place it in the toaster for 5 minutes the toaster uses 1050 watts/hour
Veronika [31]
If the power consumption is linear, then the toaster consumed 1050*(5/60)=87.5 watts.
3 0
3 years ago
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