1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lianna [129]
2 years ago
15

PLEASE HELP! WILL MARK BRAINLIEST

Mathematics
1 answer:
omeli [17]2 years ago
4 0

1)

v - 6 ≥ 4

<u>   +6  </u> <u>+6 </u>

v      ≥ 10

Graph: 10 -----------------→  <em>the dot at 10 is filled in because of the "equal to" symbol</em>

********************************************************************************************************

2)

-5x < 15

\frac{-5x}{-5} > \frac{15}{-5}  <em>divided by a negative so the symbol flipped </em>

x > -3

Graph: -3 o------------------→ <em>the dot at -3 is NOT filled in because it's NOT "equal to" </em>

********************************************************************************************************

3)

3k > 5k + 12

<u>-5k </u>  <u>-5k       </u>

-2k >          12

\frac{-2k}{-2} < \frac{12}{-2}   <em>divided by a negative so the symbol flipped </em>

k < -6

Graph: ←------------o -6   <em>the dot at -6 is NOT filled in because it's NOT "equal to" </em>

********************************************************************************************************

5)

2t ≤ 4      or    7t ≥ 49

\frac{2t}{2} \leq\frac{4}{2}      or    \frac{7t}{7} \geq \frac{49}{7}

 t ≤ 2      or      t ≥ 7

Graph: ←------- 2        7 ---------→   <em>the dots at 2 and 7 are filled in</em>

********************************************************************************************************

6)

| n + 2 | = 4

n + 2 = 4      or     n + 2 = -4

<u>     -2</u>   <u>-2 </u>             <u>     -2 </u>   <u>-2 </u>

n      = 2        or     n       = -6

Answer: n = {2, -6}

********************************************************************************************************

7)

| 2x - 7 | > 1

2x - 7 > 1       or     2x - 7 < -1

<u>      +7</u>  <u>+7 </u>             <u>     +7 </u>   <u>+7 </u>

2x      > 8       or     2x     <  6

    \frac{2x}{2} > \frac{8}{2}             or       \frac{2x}{2} < \frac{6}{2}

    x > 4          or         x < 3

Graph: ←----------o 3      4 o------------→

********************************************************************************************************

8)

A = {1, 2, 3, 4, 5, 6, 7, 8, 9}    B = {2, 4, 6, 8}

A U B = {1, 2, 3, 4, 5, 6, 7, 8, 9}    <em>union combines both sets</em>

A ∩ B =  {2, 4, 6, 8}   <em>intersection includes only those that are in BOTH sets</em>

********************************************************************************************************

9)

P = {1, 5, 7, 9, 13}   R = { 1, 2, 3, 4, 5, 6, 7}    Q = {1, 3, 5}

P ∩ R ∩ Q = {1, 5}

P ∩ R = {7}  <em>disregard 1 & 5 since they are already in </em>P∩Q∩R

R ∩ Q = {3}  <em>disregard 1 & 5 since they are already in </em>P∩Q∩R

P ∩ Q = { }  <em>disregard 1 & 5 since they are already in </em>P∩Q∩R

P no intersection = {9, 13)

R no intersection = {2, 4, 6}

Q no intersection = {  }

If you can't figure out how to draw it based on the information I provided, please see the attached diagram. <em>Note: Usially, you would only identify P, Q, R.  I identified the intersections so you would understand why those specific numbers are placed in the designated sections.</em>





You might be interested in
Questions 1&amp;2 I need help with who can help me
gayaneshka [121]
What do you need help with? it helps us to know the question!
7 0
3 years ago
J.J.Bean sells a wide variety of outdoor equipment and clothing. The company sells both through mail order and via the internet.
melamori03 [73]

Answer:

99% confidence interval for the true mean difference between the mean amount of mail-order purchases and the mean amount of internet purchases is [$(-31.82) , $12.02].

Step-by-step explanation:

We are given that a random sample of 16 sales receipts for mail-order sales results in a mean sale amount of $74.50 with a standard deviation of $17.25.

A random sample of 9 sales receipts for internet sales results in a mean sale amount of $84.40 with a standard deviation of $21.25.

The pivotal quantity that will be used for constructing 99% confidence interval for true mean difference is given by;

                      P.Q.  =  \frac{(\bar X_1-\bar X_2)-(\mu_1-\mu_2)}{s_p \times \sqrt{\frac{1}{n_1}+\frac{1}{n_2} } }  ~ t__n_1_+_n_2_-_2

where, \bar X_1 = sample mean for mail-order sales = $74.50

\bar X_2 = sample mean for internet sales = $84.40

s_1 = sample standard deviation for mail-order purchases = $17.25

s_2 = sample standard deviation for internet purchases = $21.25

n_1 = sample of sales receipts for mail-order purchases = 16

n_2 = sample of sales receipts for internet purchases = 9

Also,  s_p =\sqrt{\frac{(n_1-1)\times s_1^{2}+(n_2-1)\times s_2^{2} }{n_1+n_2-2} }  =  \sqrt{\frac{(16-1)\times 17.25^{2}+(9-1)\times 21.25^{2} }{16+9-2} } = 18.74

The true mean difference between the mean amount of mail-order purchases and the mean amount of internet purchases is represented by (\mu_1-\mu_2).

Now, 99% confidence interval for (\mu_1-\mu_2) is given by;

             = (\bar X_1-\bar X_2) \pm t_(_\frac{\alpha}{2}_)  \times s_p \times \sqrt{\frac{1}{n_1} +\frac{1}{n_2}}

Here, the critical value of t at 0.5% level of significance and 23 degrees of freedom is given as 2.807.

          = (74.50-84.40) \pm (2.807  \times 18.74 \times \sqrt{\frac{1}{16} +\frac{1}{9}})

          = [$-31.82 , $12.02]

Hence, 99% confidence interval for the true mean difference between the mean amount of mail-order purchases and the mean amount of internet purchases is [$(-31.82) , $12.02].

5 0
3 years ago
Equivalent answers for 64 to the power of 2/3
madreJ [45]

Answer:

16

Step-by-step explanation:

Dealing with a fraction exponent on hand can be converted by using the fractional exponents rule where the fraction exponent is converted to something like this:

64^\frac{2}{3} = \sqrt[3]{64^{2}}\\

As you can see, the denominator of the fractional exponent is now the index of the radical. Here is a guide to know what goes where.

64^\frac{x}{y} = \sqrt[y]{64^{x}}

Both the original problem (64^2/3) and the converted formula can be put into a calculator.

<u>Simplify (if you want to)</u>

<u />\sqrt[3]{64^{2}}\\\sqrt[3]{4096}\\16<u />

<u />

64 to the power of 2/3 is 16.

5 0
3 years ago
Match each value with its formula for ABC.
Ivahew [28]

For the triangle ABC use the sine theorem:

\dfrac{a}{\sin A}= \dfrac{b}{\sin B}= \dfrac{c}{\sin C}.

1. From \dfrac{a}{\sin A}= \dfrac{b}{\sin B} you have \dfrac{a}{b} \cdot \sin B=\sin A.

2. From \dfrac{b}{\sin B}= \dfrac{c}{\sin C} you have \dfrac{b}{c} \cdot \sin C=\sin B.

3. From \dfrac{a}{\sin A}= \dfrac{c}{\sin C} you have \dfrac{c}{a} \cdot \sin A=\sin C.

4. From \dfrac{a}{\sin A}= \dfrac{c}{\sin C} you have \dfrac{\sin A}{\sin C} \cdot c=a.

5. From \dfrac{a}{\sin A}= \dfrac{b}{\sin B} you have \dfrac{\sin B}{\sin A} \cdot a=b.

6. From \dfrac{b}{\sin B}= \dfrac{c}{\sin C} you have \dfrac{\sin C}{\sin B} \cdot b=c.

5 0
3 years ago
Read 2 more answers
5. The coordinates of the points A and B are (0, 6)
ella [17]
I need to answer two questions to ask again sorry
8 0
3 years ago
Other questions:
  • How do you solve 7x-5x+2x+23
    12·1 answer
  • Which statement best summarizes this passage?
    11·1 answer
  • (3x² + 6x + 1) = (3x)​
    7·1 answer
  • Can someone solve this for me???
    7·1 answer
  • Please someone help me please it's due in 5 minutes please please. Please don’t answer if you don’t know
    9·1 answer
  • Help asap please, i need answers for a) b) and c)​
    11·2 answers
  • Can someone help me solve this using factoring and explain plz… I will mark brainliest
    8·2 answers
  • A migrating bird flies 420 miles in 14 hours. How many miles does it fly in 5 hours?
    15·1 answer
  • Write an equation that has exactly one solution<br><br> 2(7x + 4) - x = _x + _
    8·1 answer
  • HELP PLEASE (GIVING BRAINLIEST))
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!