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2 years ago

Combine like terms and write an equivalent expression with fewer terms: 4 - 2x + 5x

Mathematics

1 answer:

borishaifa [10]2 years ago

8 0

Answer:

4 - 3x

Step-by-step explanation:

negative 2x plus 5x equals 3x

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Solve the system of equations by finding the reduced row echelon form of the augmented matrix. Write the solutions for x and y i

Gwar [14]

Answer:

The solutions for the given system of equations are:

$\left \{ {{x=-5} \atop {y=12-4z}} \right.$

Step-by-step explanation:

Given the equation system:

$\left \{ {{3x+y+4z=-3} \atop {-x+y+4z=17}} \right.$

We obtain the following matrix:

$\left[\begin{array}{cccc}3&1&4&-3\\-1&1&4&17\end{array}\right]$

Step 1: Multiply the fisrt row by 1/3.

$\left[\begin{array}{cccc}1&\frac{1}{3} &\frac{4}{3}&-1\\-1&1&4&17\end{array}\right]$

Step 2: Sum the first row and the second row.

$\left[\begin{array}{cccc}1&\frac{1}{3} &\frac{4}{3}&-1\\0&\frac{4}{3} &\frac{16}{3}&16\end{array}\right]$

Step 3: Multiply the second row by 3/4.

$\left[\begin{array}{cccc}1&\frac{1}{3} &\frac{4}{3}&-1\\0&1 &4&12\end{array}\right]$

Step 4: Multiply the second row by -1/3 and sum the the first row.

$\left[\begin{array}{cccc}1&0 &0&-5\\0&1 &4&12\end{array}\right]$

The result of the reduced matrix is:

$\left \{ {{x=-5} \atop {y+4z=12}} \right.$

This is equal to:

$\left \{ {{x=-5} \atop {y=12-4z}} \right.$

These are the solutions for the system of equations in terms of z, where z can be any number.

6 0

2 years ago

Factor completely x^8 − 625.

Gala2k [10]

Answer:(X^2-5)(x^2+5)(x^4+25)

Step-by-step explanation:

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3 years ago

Tell me something funny and I’ll mark you brainliest!

prohojiy [21]

Answer:

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shake

Step-by-step explanation:

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3 years ago

if the speed of sound is 344 meters per second, what is the approximate speed of sound, in meters per hour?

choli [55]

Since we already know that the speed of sound is 344m per second, there are 60 seconds in one minute, and there are 60 minutes in one hour, we just multiply 344 by 60, giving us 20,640. Then we multiply 20,640 by 60 to get an answer of 1,238,400 meters per hour.

4 0

3 years ago

Classify the product as a whole number

ch4aika [34]

Let's solve for the answer to determine if it is rational.

$\frac{-2 \frac{2}{5} }{-4}=12/5/4= \frac{3}{5} 


$ it is a rational number.

4 0

2 years ago