3 years ago

Select the correct answer.

Mathematics

1 answer:

insens350 [35]3 years ago

6 0

Answer:

27x-3

Step-by-step explanation:

15x +21 - 24 + 12x

= 27x -3

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Can you think of any 2x2 matrices d for which cd = dc for all 2x2 matrices c? give 2 different examples of such matricesd.

Ksju [112]

For any arbitrary 2x2 matrices $\mathbf C$ and $\mathbf D$ , only one choice of $\mathbf D$ exists to satisfy $\mathbf{CD}=\mathbf{DC}$ , which is the identity matrix.

There is no other matrix that would work unless we place some more restrictions on $\mathbf C$ . One such restriction would be to ensure that $\mathbf C$ is not singular, or its determinant is non-zero. Then this matrix has an inverse, and taking $\mathbf D=\mathbf C^{-1}$ we'd get equality.

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3 years ago

Inverse of f(x)=-5x+15

Otrada [13]

f(x) = -5x - 15

Let y = f(x)

y = -5x - 15

Switch the x and y places, and solve for y:

x = -5y - 15

-5y = x + 15

y = (x + 15)/-5

y = -(x/5) - 3

So the inverse of : f(x) = -5x - 15 is

-x/5 - 3

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4 years ago

5y + 4(-5 + 3y) = 1 – y solve step by step please

Studentka2010 [4]

Step by step, meaning explaining the equation right and answer?

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4 years ago

Read 2 more answers

What are the x and y of y=3x-7 y=2x-5

stiv31 [10]

Answer:

x=2 and y=-1

Step-by-step explanation:

set equations equal

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3 years ago

What is the GCF of 147y^3 , 245y^2

NikAS [45]

147 = 3 * 7 * 7
245 = 5 * 7 * 7

so the gcf is 7*7 = 49

abd gcf of y^3 and y^2 is y^2

answer:- 49y^2

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3 years ago