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MakcuM [25]
3 years ago
9

Solve the equation by completing the square. x2-3x-3=0

Mathematics
1 answer:
Alina [70]3 years ago
4 0

The answer is
x =  \frac{3}{2}  +  -  \sqrt{ \frac{21}{2} }


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The residents of a certain dormitory have collected the following data: People who live in the dorm can be classified as either
Ad libitum [116K]

Answer:

The steady state proportion for the U (uninvolved) fraction is 0.4.

Step-by-step explanation:

This can be modeled as a Markov chain, with two states:

U: uninvolved

M: matched

The transitions probability matrix is:

\begin{pmatrix} &U&M\\U&0.85&0.15\\M&0.10&0.90\end{pmatrix}

The steady state is that satisfies this product of matrixs:

[\pi] \cdot [P]=[\pi]

being π the matrix of steady-state proportions and P the transition matrix.

If we multiply, we have:

(\pi_U,\pi_M)*\begin{pmatrix}0.85&0.15\\0.10&0.90\end{pmatrix}=(\pi_U,\pi_M)

Now we have to solve this equations

0.85\pi_U+0.10\pi_M=\pi_U\\\\0.15\pi_U+0.90\pi_M=\pi_M

We choose one of the equations and solve:

0.85\pi_U+0.10\pi_M=\pi_U\\\\\pi_M=((1-0.85)/0.10)\pi_U=1.5\pi_U\\\\\\\pi_M+\pi_U=1\\\\1.5\pi_U+\pi_U=1\\\\\pi_U=1/2.5=0.4 \\\\ \pi_M=1.5\pi_U=1.5*0.4=0.6

Then, the steady state proportion for the U (uninvolved) fraction is 0.4.

4 0
3 years ago
Peter walked for 2/5 mile to Fred's house and then 1/2 mile to the park. How can he write 2/5 and 1/2 as pair of fractions with
andre [41]
4/10 and 5/10 i think unless i totally failed
6 0
3 years ago
Read 2 more answers
Which statement explains the equation (6×3)×2=6×(3×2​
Tju [1.3M]

They both equal the same thing

(6 x 3) x 2 = 36

6 x(3 x 2) = 36

6 0
3 years ago
What is an equation of the line that passes through the point (-4,3) and is
Tom [10]

Answer:

5x + 4y = - 8

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Given

4x - 5y = 20 ( subtract 4x from both sides )

- 5y = - 4x + 20 ( divide all terms by - 5 )

y = \frac{4}{5} x - 4 ← in slope- intercept form

with slope m = \frac{4}{5}

Given a line with slope m then the slope of a line perpendicular to it is

m_{perpendicular} = - \frac{1}{m} = - \frac{1}{\frac{4}{5} } = - \frac{5}{4} , thus

y = - \frac{5}{4} x + c ← is the partial equation

To find c substitute (- 4, 3) into the partial equation

3 = 5 + c ⇒ c = 3 - 5 = - 2

y = - \frac{5}{4} x - 2 ← in slope- intercept form

Multiply through by 4

4y = - 5x - 8 ( add 5x to both sides )

5x + 4y = - 8 ← equation in standard form

3 0
3 years ago
Given line L = ax + by + c = 0, b(its suppose to be the equal sign with the slash going thru it) 0
Serga [27]
<span>ax + by + c = 0
by = - ax - c
  y = -a/b (x) - c/b

so slope = </span>-a/b

answer
-a/b
8 0
3 years ago
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