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3 years ago

10

Help please ............ solveSolve X-3y=z-x+2y=-3

1 answer:

Alenkasestr [34]3 years ago

8 0

You don't need 3 equations to get a general solution. To do this use the equations x-3y-z=0 and -x+2y+0z= -3. Start out by letting z = t. Then solving those 2 equations simultaneously, your x's cancel out leaving you with -y-z=-3. But since z=t, then -y=-3+t or y=3-t. Now sub that in for y in the first equation, along with the fact that z=t to get x-3(3-t)-t = 0 and solve for x. x=9-2t. So a general solution for this would be (9-2t, 3-t, t)

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PLEASE HURRY IM TIMED!!!

andriy [413]

<u>Answer-</u>

<em>A. Brandon’s sound intensity level is 1/4th as compared to Ahmad’s.</em>

<u>Solution-</u>

Given that, loudness measured in dB is

$L=10\log \frac{I}{I_0}$

Where,

I = Sound intensity,

I₀ = 10⁻¹² and is the least intense sound a human ear can hear

Given in the question,

I₁ = Intensity at Brandon's = 10⁻¹⁰

I₂ = Intensity at Ahmad's = 10⁻⁴

Then,

$L_1=10\log \frac{I_1}{I_0}=10\log \frac{10^{-10}}{10^{-12}}=10\log \frac{1}{10^{-2}}=10\log 10^{2}=2\times10\log 10=20$

$L_2=10\log \frac{I_2}{I_0}=10\log \frac{10^{-4}}{10^{-12}}=10\log \frac{1}{10^{-8}}=10\log 10^{8}=8\times10\log 10=80$

$\therefore \frac{L_1}{L_2} =\frac{20}{80} =\frac{1}{4}$

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3 years ago

Explain why a rotation of 90 degrees around any point zero never maps a line to a line parallel to itself

Elis [28]

Answer:

Since zero is on the origin (0,0) a 90 degree rotation will intercept the origin no matter what so, it can't be parallel.

Step-by-step explanation:

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3 years ago

A rectangle prism has a square base of 12 inches and a height of 7 inches. What is the volume of the prism?

Natali [406]

1,008 is the answer I got

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3 years ago

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goblinko [34]

Given the exponential function:

$g(x)=2^{x-8}+1$

The starting point is found when x = 0.

So, let's substitute x by 0.

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Answer: The starting point is (0, 1.004).

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1 year ago

Juan will spend $28 on gifts. So far, he has spent 16. What are the possible additional amounts he will spend?

harina [27]

Answer:

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Step-by-step explanation:

because juan is spend 28 on gift and he added a 16 .

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3 years ago