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3 years ago

Solve for x. Enter the solutions from least to greatest. (-5x + 4)(x – 3) = 0

Mathematics

1 answer:

julia-pushkina [17]3 years ago

7 0

Answer:

x = 4/5, and x = 3

Step-by-step explanation:

set both parts of the equation equal to 0

-5x+4 =0

-5x= -4

divide by -5

x= 4/5

x-3 = 0

x=3

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Solve for w 14= -7/8w , show your work

cestrela7 [59]

Answer:

Step-by-step explanation:

14 = -7w/8

Cross multiply

-7w = 14 × 8

-7w = 112

w = 112/-7

w = -16

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3 years ago

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nikklg [1K]

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3 years ago

If A is nonsingular, then (AT )-1 =(A-1) T . (a) Verify this theorem for 2 × 2 matrices

kipiarov [429]

Answer:

Verified

Step-by-step explanation:

Let the 2x2 matrix A be in the form of:

$\left[\begin{array}{cc}a&b\\c&d\end{array}\right]$

Where det(A) = ad - bc # 0 so A is nonsingular:

Then the transposed version of A is

$A^T = \left[\begin{array}{cc}a&c\\b&d\end{array}\right]$

Then the inverted version of transposed A is

$(A^T)^{-1} = \frac{1}{ad - cb} \left[\begin{array}{cc}a&-c\\-b&d\end{array}\right]$

The inverted version of A is:

$A^{-1} = \frac{1}{ad - bc}\left[\begin{array}{cc}a&-b\\-c&d\end{array}\right]$

The transposed version of inverted A is:

$(A^{-1})^T = \frac{1}{ad - bc}\left[\begin{array}{cc}a&-c\\-b&d\end{array}\right]$

We can see that

$(A^T)^{-1} = (A^{-1})^T$

So this theorem is true for 2 x 2 matrices

3 0

3 years ago

PLEASE HELP!!!<br><br> i’ll mark brainliest if you’re correct!

ira [324]

Answer:

1.5

Step-by-step explanation:

15/10=1.5

21/14=1.5

Check:

10x1.5=15

Hope this helps!

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2 years ago

a carpet cost $15 per square foot. ( When calculating the price, any fraction of a square foot is counting as a whole square foo

gregori [183]

300 dollars, 15x20 because they count any fraction as a foot, so is like you are going to buy 20 foot of carpet.

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4 years ago