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Vesnalui [34]
4 years ago
13

Use the Quadratic Formula to solve the equation. (Enter your answers as a comma-separated list.) 13x^2 +1 = -10

Mathematics
1 answer:
12345 [234]4 years ago
3 0

Step-by-step explanation:

The given quadratic equation is :

13x^2 +1 = -10x\\\\or\\\\13x^2+10x+1=0

The formula to solve a quadratic equation is :

x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}

Put a = 13, b = 10 and c = 1

So,

x=\dfrac{-10\pm \sqrt{10^2-4(13)(1)} }{2(13)}\\\\x=-0.118, -0.651

Hence, this is the required solution.

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.Use the linear combination method to solve the system of equations. –3x + 8y = 16 3x + 4y = 8 What is the value of x?
guapka [62]

Answer:

The value of x is 0

Step-by-step explanation:

The given equations are

-3x+8y=16...(1)

3x+4y=8...(2)

We add the equattion (1) and equation (2) to obtain;

0x+12y=24

\Rightarrow y=\frac{24}{12}

\Rightarrow y=2

We put y=2 into equation (2) to obtain;

3x+4(2)=8

\Rightarrow 3x+8=8

\Rightarrow 3x=8-8

Simplify

\Rightarrow 3x=0

Divide through by 3.

\Rightarrow x=0

The solution to the system is

(0,2)

The x-value is 0

6 0
3 years ago
Read 2 more answers
If I roll a 6 sided dice and then flip a coin,
lina2011 [118]

Answer:

1/12

Step-by-step explanation:

5 0
3 years ago
At Cheng's Bike Rentals, it costs $25 to rent a bike for 5 hours.
timurjin [86]

Answer:

25÷5=5

So the answer is (5)

7 0
2 years ago
jenny won the ping pong championship eight more times than gerardo. they have won a combined total of 32 championship
Lena [83]
X + x +8 = 32
2x + 8 = 32
2x = 24
x = 12
So gerardo has won 12 and jenny has won 20
3 0
4 years ago
23 POINTS AND WILL GET BRAINLIEST!!
Phoenix [80]

The difference in percentage of youngest and oldest age groups is 15.4%

<h3>The percentage from 11 to 20</h3>

Start by calculating the total number of people, as follows

People = 102 + 36 + 66 + 150 + 78 + 60 + 90 + 11 + 9

Evaluate

People = 602

The number of people in the age group 11 to 20 is:

Group = 36

So, the percentage is

Percentage = 36/602

Percentage = 6.0%

Hence, the percentage from 11 to 20 is 6.0%

<h3>The percentage from 31 to 40</h3>

The number of people in the age group 31 to 40 is:

Group = 150

So, the percentage is

Percentage = 150/602

Percentage = 24.9%

Hence, the percentage from 31 to 40 is 24.9%

<h3>The percentage from 71 to 80</h3>

The number of people in the age group 71 to 80 is:

Group = 11

So, the percentage is

Percentage = 11/602

Percentage = 1.8%

Hence, the percentage from 71 to 80 is 1.8%

<h3>The lowest percentage</h3>

This is the percentage of age group 81 to 90

And, the percentage is

Percentage = 9/602

Percentage = 1.5%

Hence, the lowest percentage on the chart is 5%

<h3>The percentage from 51 to 60 and 61 - 70 combined</h3>

The number of people in the age group 31 to 70 is:

Group = 60 + 90 = 15-

So, the percentage is

Percentage = 150/602

Percentage = 24.9%

Hence, the percentage from 51 to 60 and 61 - 70 combined is 24.9%

<h3>The difference in percentage of youngest and oldest</h3>

The youngest is 0 to 10 and the oldest is 81 to 90.

The number of people in these age groups are:

Youngest = 102

Oldest = 9

The difference is

Difference = 102 - 9

Difference = 93

So, the percentage is

Percentage = 93/602

Percentage = 15.4%

Hence, the difference in percentage of youngest and oldest is 15.4%

Read more about percentage at:

brainly.com/question/843074

#SPJ1

6 0
2 years ago
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