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1 year ago

99 + 81 = 9(11 help eeeeeeeeeeeeeeee

Mathematics

2 answers:

Leokris [45]1 year ago

3 0

Answer:

180?

Step-by-step explanation:

Gelneren [198K]1 year ago

3 0

99+81=180 I hope that’s what you’re asking good luck i hope you get it got a good grade (;

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nignag [31]

If $A(t)$ is the amount of salt in the tank at time $t$ , then the rate at which the amount of salt in the tank changes is given by

$\dfrac{\mathrm dA(t)}{\mathrm dt}=\dfrac{4\text{ lbs}}{1\text{ gal}}\dfrac{6\text{ gal}}{1\text{ min}}-\dfrac{A(t)\text{ lbs}}{600\text{ gal}}\dfrac{6\text{ gal}}{1\text{ min}}$
$\dfrac{\mathrm dA}{\mathrm dt}=24\dfrac{\text{lb}}{\text{min}}-\dfrac{A(t)}{100}\dfrac{\text{lb}}{\text{min}}$

Let's drop the units for now. We have

$\dfrac{\mathrm dA(t)}{\mathrm dt}+\dfrac{A(t)}{100}=24$
$e^{t/100}\dfrac{\mathrm dA(t)}{\mathrm dt}+e^{t/100}\dfrac{A(t)}{100}=24e^{t/100}$
$\dfrac{\mathrm d}{\mathrm dt}\left[e^{t/100}A(t)\right]=24e^{t/100}$
$e^{t/100}A(t)=\displaystyle24\int e^{t/100}\,\mathrm dt$
$e^{t/100}A(t)=2400e^{t/100}+C$
$A(t)=2400+Ce^{-t/100}$

We're given that the water is pure at the start, so $A(0)=0$ , giving

$A(0)=0=2400+Ce^{-0/100}\implies C=-2400$

So the amount of salt in the tank (in lbs) at time $t$ is

$A(t)=2400\left(1-e^{-t/100}\right)$

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2 years ago

The graph of a certain quadratic function does not cross the x-axis. Which of the following are possible values for the discrimi

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The graph of a quadratic function does not cross the x-axis if the discriminant has negative value.
Answers:
C ) -25
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2 years ago

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Answer:

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Step-by-step explanation:

(a) 500 - 211 = 289 289 '/. 17 = 14 r:7 14.7 dollars

(b) 17 x 5 = 85 289 - 85 = 204

hope this helped :)

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2 years ago

What is the measure of the complement?

Veronika [31]

Answer:

64°

Step-by-step explanation:

If two angles add up to give 90°, that are said to be complementary. One is a complement of the other.

Therefore, given that the measure of an angle, angle A = 26°, the measure of the complement of angle A = 90 - 26 = 64°.

The measure of the complement of angle A, is 64°.

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2 years ago

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Answer:

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Step-by-step explanation:

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