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serious [3.7K]
3 years ago
10

Susan, Chang, and Henry sent a total of 127 text messages over their cell phones during the weekend. Chang sent 3 times as many

messages as Henry. Henry sent 7 fewer messages than Susan. How many messages did they each send?
Mathematics
1 answer:
Ymorist [56]3 years ago
4 0

Answer:

c = 72, h = 24, s = 31

Step-by-step explanation:

You can derive the following equations from the text:

s+c+h=127

c=3h

h=s-7

Solving them yields above answer.

You might be interested in
5. Rounded to three decimal places, what is the value of r for this data set?
IrinaVladis [17]

The value of correlation coefficient (r) for the dataset is 0.981

<h3>What is correlation coefficient (r)?</h3>

The correlation coefficient (r) is used to determine the closeness and association of a scatter plot points.

The dataset is given as:

  • x: 8  15  3  7  2  14
  • y: 15  21  6  12  3  20

Using a graphing calculator, we have the following parameters:

<h3>X Values </h3>
  • ∑x = 49
  • Mean = 8.167
  • ∑(X - Mx)2 = SSx = 146.833

<h3>Y Values </h3>
  • ∑y = 77
  • Mean = 12.833
  • ∑(Y - My)2 = SSy = 266.833

<h3>X and Y Combined </h3>
  • N = 6
  • ∑(X - Mx)(Y - My) = 194.167

The correlation coefficient (r) is then calculated as:

r = \frac{\sum{((x - My)(Y - Mx)) }}{ \sqrt{((SSx)(SSy))}}

This gives

r = \frac{194.167 }{ \sqrt{((146.833)(266.833))}}\\

r = 0.9809

Approximate

r = 0.981

Hence, the value of correlation coefficient (r) for the dataset is 0.981

Read more about correlation coefficient at:

brainly.com/question/4219149

3 0
2 years ago
The answers and how to solve them
Gwar [14]
A.30x+1 that's all I got
7 0
3 years ago
HELP ME PLEASE! tell me if 11,12 are right and help w/ 13
Marysya12 [62]

Answer: I know 12 is right

Step-by-step explanation:

7 0
3 years ago
What is the sum of the polynomials?
Allisa [31]

Answer:

( -  {x}^{2}  + 9) + ( - 3 {x}^{2} - 11x + 4) \\  -  {x}^{2}   + 9 - 3{x}^{2}  - 11x + 4 \\ =   - 4 {x}^{2}   - 11x + 13

4 0
3 years ago
Read 2 more answers
which is the correct simplified version of the expression shown after distrubuting and combining like terms? 1/3(9x-15)+2x​
zhannawk [14.2K]

Answer:11x + 5

Step-by-step explanation:1/3 times 9X is 3x. 1/3 times 15 is 5. Now you have 9x + 5 + 2x

9x + 2x = 11x

Final answer: 11x + 5

7 0
3 years ago
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