4 years ago

If the clock was divided into equal fractional parts every five minutes what fraction is 5 mins= hour

Mathematics

1 answer:

lesya [120]4 years ago

7 0

5 min =hour 1/12
10 min 1/6
15 min 1/4

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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

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

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

5 0

3 years ago

50 points!

trasher [3.6K]

Tan60=x/12 12tan60=14.3 so area formula: 85.8

5 0

3 years ago

Need help with this

steposvetlana [31]

Answer:

Choice 4

Step-by-step explanation:

The y-intercept if this equation would be (0,4)... making 4 the closest answer choice

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3 years ago

Read 2 more answers

Does anyone know the answer to this ? I need help!

ivanzaharov [21]

The answer is
“Yes i do know the answer”

Im jp
Its
9h+12

4 0

3 years ago

WILL MARK BRAINLIEST IF GOTTEN RIGHT IF YOU GET IT WRONG ON PURPOSE I WILL BE REPORTING YOU

Sauron [17]

Answer: im pretty sure its 5 to the second power so the third one

Step-by-step explanation:

8 0

3 years ago