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2 years ago

Solve for x. It's in the screenshot.

Mathematics

2 answers:

hram777 [196]2 years ago

6 0

Answer:

x = 14

Step-by-step explanation:

3x * 4 = -21 * -8

12x = 168

x = 168 / 12 = 14

gayaneshka [121]2 years ago

4 0

Answer:

Step-by-step explanation:

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What is the sale price of a shirt that was originally $25 but that has been marked down by 33 percent?

Hoochie [10]

Answer:

$16.25

Step-by-step explanation:

1. 33% of $25 is $8.75

2. Subtract $25.00 and $8.75

3. The answer is $16.25

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3 years ago

I need this answer quick!

marshall27 [118]

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Step-by-step explanation:

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3 years ago

30 POINTS! Consider the system of linear equations and the matrix equations below.

fiasKO [112]

Answer:

Option C is correct.

Step-by-step explanation:

-x+3y=2

4x-2y=22

In matrix form is represented as:

$\left[\begin{array}{cc}-1&3\\4&-2\end{array}\right] \left[\begin{array}{c}x&y\end{array}\right] =\left[\begin{array}{c}2&22\end{array}\right]$

AX=B

$X = A^{-1}B$

$A^{-1} = |A|/Adj A$

|A| = (-1)(-2)-(3)(4)

|A| = 2-12

|A| = -10

Adj A = $\left[\begin{array}{cc}-2&-3\\-4&-1\end{array}\right]$

A^-1 = -1/10 $\left[\begin{array}{cc}-2&-3\\-4&-1\end{array}\right]$

A^-1 = 1/10 $\left[\begin{array}{cc}2&3\\4&1\end{array}\right]$

X= A^-1 B

X = 1/10 $\left[\begin{array}{cc}2&3\\4&1\end{array}\right]$ $\left[\begin{array}{c}2&22\end{array}\right]$

X=1/10 $X=1/10\left[\begin{array}{c}2*2+3*22\\4*2+1*22\end{array}\right]\\X=1/10\left[\begin{array}{c}4+66\\8+22\end{array}\right]\\X=1/10\left[\begin{array}{c}70\\30\end{array}\right]\\X=\left[\begin{array}{c}70/10\\30/10\end{array}\right]\\X=\left[\begin{array}{c}7\\3\end{array}\right]$