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3 years ago

How many solutions does the system of equations below have? 2x – 3y = -9 4х – бу = -18

Mathematics

1 answer:

HACTEHA [7]3 years ago

3 0

Answer:

Step-by-step explanation:

because they have the same symbol which let's them be able to add or sybtract

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Find the reciprocal or multiplicative inverse of 0.1

Marina CMI [18]

10/1 or 10 is the answer bbbbbbbbb bbbb

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4 years ago

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H(x+1)=x^2-4 evaluate function by substuting x+1

zalisa [80]

Answer:

h(x + 1) = (x+3)(x-1)

Step-by-step explanation:

Simply plug the value of x+1 into the equation for x.

h(x) = x^2 - 4

h(x + 1) = (x + 1)^2 - 4

h(x + 1) = x^2 + 2x + 1 - 4

h(x + 1) = x^2 + 2x - 3

h(x + 1) = (x+3)(x-1)

Cheers.

8 0

4 years ago

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A decorative steel is shown and it is made of a circular section and 6 stems. The length of each stem is 45cm Work out the lengt

Lelechka [254]

Answer: The required length of steel is 270 cm.

Step-by-step explanation:

Since we have given that

Number of stems = 6

Length of each stem = 45 cm

So, we need to find the length of steel used in the frame.

So, Length of steel = Number of stems × Length of each stem

So, the length of steel becomes

$45\times 6\\\\=270\ cm$

Hence, the required length of steel is 270 cm.

6 0

3 years ago

Anything times 2 equal 60

arlik [135]

The answer to that question is
30

4 0

3 years ago

Help!!!!!!!!!!!!!!!!

kaheart [24]

Answer:

$\cos\alpha\sin\alpha(\cos\alpha-\sin\alpha)$

Step-by-step explanation:

First, simplify each term:

$\sin\left(\dfrac{\pi}{2}+\alpha\right)=\cos \alpha\\ \\\cos \left(\dfrac{\pi}{2}+\alpha\right)=-\sin \alpha\\ \\\cos \left(\alpha-\dfrac{3\pi}{2}\right)=-\sin \alpha\\ \\\sin \left(\dfrac{3\pi}{2}+\alpha\right)=-\cos \alpha$

Then given expression is equivalent to

$\cos ^3\alpha+(-\sin \alpha)^3-(-\sin \alpha)+(-\cos \alpha)\\ \\=\cos ^3\alpha-\sin^3 \alpha+\sin \alpha-\cos \alpha\\ \\=(\cos\alpha-\sin\alpha)(\cos^2\alpha+\cos\alpha\sin\alpha+\sin^2\alpha)-(\cos\alpha-\sin\alpha)\\ \\=(\cos\alpha-\sin\alpha)(1+\cos\alpha\sin\alpha-1)\ \ [\cos^2\alpha+\sin^2\alpha=1]\\ \\=\cos\alpha\sin\alpha(\cos\alpha-\sin\alpha)$

6 0

3 years ago