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2 years ago

12

Factor the expression: 84x – 12x

2 answers:

liberstina [14]2 years ago

6 0

Subtract 12x from 84x = 72x

iris [78.8K]2 years ago

3 0

Subtract 84x and 12x from each other to simplify or factor the expression and you get 72x

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672,591 is closer to

Firlakuza [10]

672,591 is rounded to 700,000.

5 0

2 years ago

the greenhouse effect occurs on many planets . if the actual temp of venus is -40 degrees , and the temp of the greenhouse is 80

jarptica [38.1K]

A difference of 840 degrees

800 - (-40) = 840

When removing a negative number from a positive number you get a positive

- + - = +
800 - (-40)
^ ^
Negatives (2)

4 0

3 years ago

-x=-y+2 and 3y+4=2x solve using matrices

MissTica

$\begin{cases}-x=-y+2\\3y+4=2x\end{cases}\implies\begin{cases}x-y=-2\\2x-3y=4\end{cases}$

In matrix form, this is

$\begin{bmatrix}1&-1\\2&-3\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}-2\\4\end{bmatrix}$

The coefficient matrix has determinant

$\begin{vmatrix}1&-1\\2&-3\end{vmatrix}=-3+2=-1\neq0$

so it has an inverse, which is

$\begin{bmatrix}1&-1\\2&-3\end{bmatrix}^{-1}=\begin{bmatrix}3&-1\\2&-1\end{bmatrix}$

Multiply both sides by the inverse matrix:

$\begin{bmatrix}3&-1\\2&-1\end{bmatrix}\begin{bmatrix}1&-1\\2&-3\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}3&-1\\2&-1\end{bmatrix}\begin{bmatrix}-2\\4\end{bmatrix}$

$\implies\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}-10\\-8\end{bmatrix}$

so that $x=-10$ and $y=-8$ .

8 0

3 years ago

Angie's car is valued at $22,000, and she owes $20,000 on it. What is her<br><br> current equity?

amid [387]

Answer: 2,000

Step-by-step explanation: 22,000 - 20,000 = 2,000

Angie’s current equity on her car is 2,000

6 0

2 years ago

Read 2 more answers

If pqr= 1 show that 1/(1+p+q^-1)+1/(1+q+r^-1)+1/(1+r+p^-1) = 1.<br>

mariarad [96]

Answer:

1

Step-by-step explanation:

1/(1+p+q^-1)+1/(1+q+r^-1)+1/(1+r+p^-1) = 1.

7 0

2 years ago

Read 2 more answers