Mathematics College

if the mean of the numbers 2x,3x,4x and 3x is 12,then the sum of the numbers is?
a)4
b)12
c)48
d)80​

Answers

Answer 1

Answer:

C. 48.

Step-by-step explanation:

If the mean is 12, then 12 must be 2x, 3x, 4x, and 3x divided by 4.

      --> [tex]\frac{2x+3x+4x+3x}{4}=12[/tex]

      --> [tex]\frac{12x}{4}=12[/tex]

      --> [tex]\\3x=12[/tex]

      --> x=4

Add: 2x+3x+4x+3x=8+12+16+12=48

Related Questions

If y varies inversely with x
and y is 10 when x is 5,
then what is y when x is 2?

Answers

9514 1404 393

Answer:

  25

Step-by-step explanation:

Inverse variation means ...

  y = k/x

For the given values, we can find k to be ...

  k = xy = (5)(10) = 50

Then for x=2, we have ...

  y = 50/x

  y = 50/2

  y = 25 . . . when x=2

16fy
What is the rate of change of the function shown on the
graph? Round to the nearest tenth.
14
12-
(2.12.5)
02.00
0 2.50
5.25
10 -
000
0 10.50
(1,5)
4
(-1,0.8) 3 (0, 2)
-4 -3 -2
12
3
4
X
2.
-4
-6

Answers

Answer:

?????????????????????????????????

Answer:

B

Step-by-step explanation:

14 out of 49 as a percentage

Answers

Answer:

28.57%

Step-by-step explanation:

Cell G: 4.21×10^-3 cm
Cell H: 9.2×10-4 cm

How many times larger is the diameter of cell G than the diameter cell H? Write your answer in standard notation, rounding to the nearest tenth. ​

Answers

Answer:

0.00421 centimeters.

Step-by-step explanation:

thats ur answer

Answer:

I believe that your answer would be 2.18527315×10^-1

Simplified would be 2.2×10^-1

Step-by-step explanation:

I hope this helps

Peggy is p years old. ​ ​Maggie is 1 year less than 1/4 of Peggy's age. ​ ​What is Maggie's age in terms of p?
​

Answers

Answer:

1/2m+100

Step-by-step explanation:

If X = 3 units, Y = 3 units, and Z = 4 units, then what is the surface area of the right triangular pyramid shown above?

Answers

Answer:

36

Step-by-step explanation:

you have to multiple and find the other area

The area for the trapezoid is__in2.

Answers

Answer:

1204 in squared

Step-by-step explanation:

Please answer the blanks

Answers

5/6=10/12
10/12=5/6
3/12=9/4
3/4=9/12

Answer:

5/6=10/12 10/12=5/6 3/12=1/4 3/4=9/12

how do you solve this?

Answers

Answer:

Undefined Slope

Step-by-step explanation:

slope formula = y2-y1/x2-x1

-17 - 12/3 - 3

-29/0

divide by zero, undefined

Has anyone have a friend that became so close to you and then she or he started ignoring you for the rest of the time and even being close to you?

Answers

Answer:

yeah it sucks I'm sorry that happened to you. it'll get better. never be friends with that toxic person again.

What is the value of x?

Answers

Answer:

33.5

Step-by-step explanation:

4x+5+41=180

4x+46=180

4x=180-46

4x=134

4x=33.5

can somebody help me?

Answers

Answer:

1.− 12 b + 6 c + 18

2.− 6 ( 2 b − c − 3 )

Step-by-step explanation:

hope that helps

if correct please mark as brainliest

thank you

:)

Nielson Media Research wants to estimate the mean amount of time (in minutes) that full-time college students spend watching television each weekday. Find the sample size necessary to estimate that mean with a 15-minute sampling error. Assume 96% confidence level is desired. Also assume that a pilot study showed that the standard deviation is estimated to be 112.2 minutes.

Answers

Answer:

The sample size necessary is 237.

Step-by-step explanation:

We have that to find our [tex]\alpha[/tex] level, that is the subtraction of 1 by the confidence interval divided by 2. So:

[tex]\alpha = \frac{1 - 0.96}{2} = 0.02[/tex]

Now, we have to find z in the Ztable as such z has a pvalue of [tex]1 - \alpha[/tex].

That is z with a pvalue of [tex]1 - 0.02 = 0.98[/tex], so Z = 2.056.

Now, find the margin of error M as such

[tex]M = z\frac{\sigma}{\sqrt{n}}[/tex]

In which [tex]\sigma[/tex] is the standard deviation of the population and n is the size of the sample.

Find the sample size necessary to estimate that mean with a 15-minute sampling error.

A sample size of n is necessary.

n is found when [tex]M = 15[/tex]

We have that [tex]\sigma = 112.2[/tex]

So

[tex]M = z\frac{\sigma}{\sqrt{n}}[/tex]

[tex]15 = 2.056\frac{112.2}{\sqrt{n}}[/tex]

[tex]15\sqrt{n} = 2.056*112.2[/tex]

[tex]\sqrt{n} = \frac{2.056*112.2}{15}[/tex]

[tex](\sqrt{n})^2 = (\frac{2.056*112.2}{15})^2[/tex]

[tex]n = 236.5[/tex]

Rounding up,

The sample size necessary is 237.

can u answer this please​

Answers

Answer:

Check pdf

Step-by-step explanation:

NOT TOO HARD NEED HELP

Answers

Answer:

perimeter = 12x+10 area=8x^2+14x+6

Step-by-step explanation:

A

2x+2+2x+2+4x+3+4x+3

2x+2x+4x+4x+2+2+3+3

4x+4x+4x+2+2+3+3

8x+4x+2+2+3+3

12x+2+2+3+3

12x+4+3+3

12x+7+3

12x+10

B

(2x+2)(4x+3)

8x^2+8x+6x+6

8x^2+14x+6

Calculate -7x + 8 + 9 - 3x if x =9​

Answers

Answer:

-73 is the simplified answer

Step-by-step explanation:

a square with 4 congruent isocelies triangles if the length of x is 12 what's the length of the feet

Answers

Is there a picture attached to this??

Answer:

ya yeet 69 420 peepeepoopoo check

Step-by-step explanation:

I HAVE 69 CHILDREN WJANAJSNJSSJJSJSJSJSJDJDJDJDJDJDJDJDJDHDJDBDNDJDJJDJDJDJDYFUWOQOZJCBFBDJXKWJWIFOIGCHBSJQLSOCOCFHHWJWKWROTOGU HSNQJXshsnanqmqmqn1j1n1nNNNNNNRRRRRRRRRGGGRRRRRRRNNNNEEEEEEEEQQQQQQWWWWWAAAAARRRRRRRRRRRRNNNNNIIIIIIIGGGGGGGGGEEEEERRRRRRRRRRRnbjjjjjj

What is the formula for calculating Cone?​

Answers

V= πr2(the two is an exponent* h/3 (it’s a fraction)
v=(pie)r2
(i cant find the pie simbol)

Pls help asap giving 10 points
Don’t mind the answer I accidentally clicked

Answers

Answer:

18.08 ft. (You were right congrats!)

Step-by-step explanation:

24 = b

217 = A

In this you are solving for h.

Formula for area of triangle = bh/2

Isolate h = 2 x A/b

2 x 217/24 = 18.08.

Answer:

The answer is 18.08 thanks for the points

HELP HOW DO YOU DO THIS

Answers

Answer:

X = 49

Step-by-step explanation:

The top angle that measures 126° is a mirrored version of the angle measuring  (x + 77)°. The means the angle, (x + 77)°, has to measure 126°. So, to get x you have to subtract 126 by 77 and that gives you 49.

Kayla has 1,000 Apples in 5 bags, Mack has 999 apples in 5 bags as well, how many apples does Kayla have THAN Mack? Mack said that it is 10 apples that he is missing to match Kayla, Kayla said its only one apple he is missing to match hers.1,000-999=? who is correct? ( kayla or Mack? )

Answers

Kayla is correct because if she has 1,000 and Mack has 999, then that means he needs only one more Apple to be equal with Kaylas amount of apples . 999+ 1 = 1,000

Pleaseeeeeeeee help meeeeEEEEEEEE IM HAVING A BREAKDOWN JUST PLEAAE HELPPPP

Answers

Answer:

all you got to do at the Sheldon also picks tomatoes from his garden.  He picked 5 310 kg, but 1.5 kg were rotten and had to be thrown away.  How many kilograms of tomatoes were not rotten?  Write an equation that shows how you reached your answer.

Step-by-step explanation:

Sheldon also picks tomatoes from his garden.  He picked 5 310 kg, but 1.5 kg were rotten and had to be thrown away.  How many kilograms of tomatoes were not rotten?  Write an equation that shows how you reached your answer.

Answer this correctly with an explanation and I’ll give u brainalist + 10 points

Answers

Answer:

A because when you add the angles up it has to equal 180

Step-by-step explanation:

Answer:

A) ∠ABC and ∠DEF

Step-by-step explanation:

Supplementary angles add up to 180 degrees total. So if you take 180 and subtract 118 you get 62.

∠ABC = 62

∠DEF = 118

180 - 118 = 62

180 - 62 = 118

118 + 62 = 180

When Jack, Jill, and Bill each came down the hill carrying a 48-ounce
bucket full of water. By the time they reached the bottom, Jack's bucket
was only 3/4 full. How much water did Jack spill?
14 oz.
O 12 oz.
O 3/48 oz
16 oz.


Plz HELPPPP AGIAN

Answers

he spilled 12oz of water! such easy math

Whoever answers 5 first gets brainliest

Answers

Instead of N use D in your question so the equation would be T(D)=6(D) and put in what day it is to get number of miles hope that helped

Banu will build a fence around a rectangular
30-foot-by-25-foot play area. Given that fencing costs
$4.05 per foot, how much will the fencing cost for
Banu to completely surround the play area?

Answers

Answer:

A

Step-by-step explanation:

Dimension of the rectangular fence:

Length = 30 ft

Width = 25 ft

Perimeter of the rectangular fence = 2(L + W)

= 2(30 + 25) = 2(55)

Perimeter = 110 ft

Fencing cost per foot = $4.05

Fencing cost for 110 ft = 110 × 4.05 = $445.50

what is the area of the figure above ?

Answers

Answer:

256m^2

Step-by-step explanation:

you can cut up the figure.

A1=bh

A1= 24x8

A1=192m^2

A2=bh

A2= bh

A2=8x8

A2=64m^2

A1+A2= Atotal

A=192+64

A=256m^2

The formula for compound interest is:

Where:

A = the future value of the investment (including interest)
P = the principal investment amount (the initial deposit amount)
r = the annual interest rate (decimal)
n = the number of times that interest is compounded per year
t = the number of years the money is invested for

If Josh invests $500 in a 5-year fixed interest savings bond that pays 5% per annum, how much will his entire investment be worth at the end of the term?

Answers

Answer:

Future value, A = $642

Step-by-step explanation:

Given the following data;

Principal = $500

Interest rate = 5% = 5/100 = 0.05

Time, t = 5 years

n = 365

To find the future value, we would use the compound interest formula;

[tex] A = P(1 + \frac{r}{n})^{nt}[/tex]

Where;

A is the future value.

P is the principal or starting amount.

r is annual interest rate.

n is the number of times the interest is compounded in a year.

t is the number of years for the compound interest.

Substituting into the equation, we have;

[tex] A = 500(1 + \frac{0.05}{365})^{365*5}[/tex]

[tex] A = 500(1 + 0.000137)^{1825}[/tex]

[tex] A = 500(1.000137)^{1825}[/tex]

[tex] A = 500*1.2840 [/tex]

Future value, A = $642

lines that do not meet with each other

Answers

In geometry, parallel lines are lines in a plane which do not meet; that is, two straight lines in a plane that do not intersect at any point are said to be parallel.

A triangle has an area of 36 square feet. The height is 6 feet. What is the length of the base (in feet)?

Answers

Answer:

Answer · 6 votes

$b = 6 $ \ $ h =12$

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