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3 years ago

Copy and compltehttps://homework.russianschool.com/resource?key=0029a

Mathematics

2 answers:

Anna35 [415]3 years ago

7 0

Answer:

A. Increases by 3000%

B. Decreases by 3000%

Step-by-step explanation:

I’m not exactly sure, but yeah.

3000% = 30

So for A. Add 3000% or 30 to it to get 70

And the same for B. 70 - 3000% or 30 to get 40 again.

I hope this helps! Good luck :)

Romashka-Z-Leto [24]3 years ago

7 0

I can’t copy so sorry, hope you have a amazing week tho! Stay safe.

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Which statement correctly describes the click on the letter to your answer only

Mice21 [21]

Answer:

I say a

Step-by-step explanation:

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4 years ago

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A tank holds 300 gallons of water and 100 pounds of salt. A saline solution with concentration 1 lb salt/gal is added at a rate

Shkiper50 [21]

The amount of salt in the tank changes with rate according to

$Q'(t)=\left(1\dfrac{\rm lb}{\rm gal}\right)\left(4\dfrac{\rm gal}{\rm min}\right)-\left(\dfrac{Q(t)}{300+(4-1)t}\dfrac{\rm lb}{\rm gal}\right)\left(1\dfrac{\rm gal}{\rm min}\right)$

$\implies Q'+\dfrac Q{300+3t}=4$

which is a linear ODE in $Q(t)$ . Multiplying both sides by $(300+3t)^{1/3}$ gives

$(300+3t)^{1/3}Q'+(300+3t)^{-2/3}Q=4(300+3t)^{1/3}$

so that the left side condenses into the derivative of a product,

$\big((300+3t)^{1/3}Q\big)'=4(300+3t)^{1/3}$

Integrate both sides and solve for $Q(t)$ to get

$(300+3t)^{1/3}Q=(300+3t)^{4/3}+C$

$\implies Q(t)=300+3t+C(300+3t)^{-1/3}$

Given that $Q(0)=100$ , we find

$100=300+C\cdot300^{-1/3}\implies C=-200\cdot300^{1/3}$

and we get the particular solution

$Q(t)=300+3t-200\cdot300^{1/3}(300+3t)^{-1/3}$

$\boxed{Q(t)=300+3t-2\cdot100^{4/3}(100+t)^{-1/3}}$

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3 years ago

What is the domain of (-2, 5), (8, 6), (3, 12) (2, 6)

lord [1]

Answer:

The domain is (-2, 8, 3, 2)

Step-by-step explanation:

The domain is such because domain is the x-element or the one you see at first in the ordered pairs.

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3 years ago

Determine the nature of the roots: 4x^2 + 32x + 64 = 0

DENIUS [597]

Answer:

b. a unique real solution

Step-by-step explanation:

A quadratic equation ax² + bx + c = 0 ,

Has two distinct real roots,

If discriminant, $D=b^2 - 4ac > 1$

Has two equal real roots,

If D = 0,

Has two imaginary roots or no real roots,

if D < 1,

Here. the given qudratic equation,

$4x^2 + 32x + 64=0$

By comparing,

a = 4, b = 32, c = 64,

$\implies D = 32^2 - 4\times 4\times 64 = 1024 - 1024 = 0$

Hence, the equation has two equal real roots or a unique real solution.

i.e. OPTION 'b' is correct.

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4 years ago

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Marrrta [24]

It is 8.525. what u do is 21÷40 and get .525 and then u add the 8 in the front and get 8.525

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4 years ago