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seraphim [82]
3 years ago
5

Help please please !!!!!!!

Mathematics
1 answer:
lyudmila [28]3 years ago
7 0
In each case, you can use the second equation to create an expression for y that will substitute into the first equation. Then you can write the result in standard form and use any of several means to find the number of solutions.

System A
  x² + (-x/2)² = 17
  x² = 17/(5/4) = 13.6
  x = ±√13.6 . . . . 2 real solutions

System B
  -6x +5 = x² -7x +10
  x² -x +5 = 0
The discriminant is ...
  D = (-1)²-4(1)(5) = -20 . . . . 0 real solutions

System C
  y = 8x +17 = -2x² +9
  2x² +8x +8 = 0
  2(x+2)² = 0
  x = -2 . . . . 1 real solution
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Real easy, just can't remember. Sorry for potato quality.
Pepsi [2]
The answer is 27 because 10+17=27
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3 years ago
Solve -3x^2 - 4x - 4 = 0
shepuryov [24]

-3x^2 - 4x - 4 = 0\\\\\Delta=(-4)^2-4\cdot(-3)\cdot(-4)=16-48=-32

\Delta therefore there are no solutions in real numbers.

3 0
4 years ago
Read 2 more answers
A sample is taken from all college freshman . Right-handed students are excluded.what is this an example of?
Anarel [89]

Answer:

<em> All college freshman </em>is called <em>Population and Right handed students are excluded is called sample from Population</em>

Step-by-step explanation:

<u>Explanation</u>:-

<em>Population:</em>-  The total of the observations which we are concerned

given data <em>all college freshman </em>is called <em>Population</em>

<u><em>Sample</em></u><em> :-</em>

<em>A sample is a subset of a Population</em>

<em>Given data  all college freshman </em>is called <em>Population and Right handed students are excluded is called sample from Population</em>

4 0
3 years ago
The sales tax rate for the state of Washington was 9.4%. what is the state sales tax on a $3900 car in Washington? What is the f
MAXImum [283]

Answer:

3900 x.094 = 366.60

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3 years ago
Students reported practicing violin during the last semester for 45, 38, 52, 58, and 42 hours. What is the mean absolute deviati
Irina-Kira [14]

The mean absolute deviation for the number of hours students practiced the violin is 6.4.

<h3>What is the mean absolute deviation?</h3>

The average absolute deviation of the collected data set is the average of absolute deviations from a center point of the data set.

Given

Students reported practicing violin during the last semester for 45, 38, 52, 58, and 42 hours.

The given data set is;

45, 38, 52, 58, 42

Mean Deviation = Σ|x − μ|/N.

μ = mean, and N = total number of values

|x − μ| = |45 − 47| = 2

|38− 47| = 9

|52− 47| = 5

|58− 47| = 11

|42− 47| = 5

The mean absolute deviation for the number of hours students practiced the violin is;

\rm Mean =\dfrac{2+9+5+11+5}{5}\\\\Mean=\dfrac{32}{5}\\\\Mean = 6.4

Hence, the mean absolute deviation for the number of hours students practiced the violin is 6.4.

To know more about mean value click the link given below.

brainly.com/question/5003198

8 0
2 years ago
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