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2 years ago

Should I divide or multiply?

Mathematics

2 answers:

Yuki888 [10]2 years ago

7 0

Answer:

Divide.....

Step-by-step explanation:

I would like to have an apple though xD

lora16 [44]2 years ago

3 0

Answer:

Multiply then, subtraction

Step-by-step explanation:

Multiply 8.7 pounds for $0.98 = $8.53

$10 - 8.53 = $1.47

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Kathy swam 3 laps in the pool this week. She must swim more than 12 laps.

Marysya12 [62]

Answer:10

Step-by-step explanation:

7 0

3 years ago

Find the solution of the differential equation dy/dt = ky, k a constant, that satisfies the given conditions. y(0) = 50, y(5) =

irga5000 [103]

Answer: The required solution is $y=50e^{0.1386t}.$

Step-by-step explanation:

We are given to solve the following differential equation :

$\dfrac{dy}{dt}=ky~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)$

where k is a constant and the equation satisfies the conditions y(0) = 50, y(5) = 100.

From equation (i), we have

$\dfrac{dy}{y}=kdt.$

Integrating both sides, we get

$\int\dfrac{dy}{y}=\int kdt\\\\\Rightarrow \log y=kt+c~~~~~~[\textup{c is a constant of integration}]\\\\\Rightarrow y=e^{kt+c}\\\\\Rightarrow y=ae^{kt}~~~~[\textup{where }a=e^c\textup{ is another constant}]$

Also, the conditions are

$y(0)=50\\\\\Rightarrow ae^0=50\\\\\Rightarrow a=50$

and

$y(5)=100\\\\\Rightarrow 50e^{5k}=100\\\\\Rightarrow e^{5k}=2\\\\\Rightarrow 5k=\log_e2\\\\\Rightarrow 5k=0.6931\\\\\Rightarrow k=0.1386.$

Thus, the required solution is $y=50e^{0.1386t}.$

8 0

3 years ago

Read 2 more answers

Please help. I have attached a picture.

Ksivusya [100]

Answer: Choice C) -1/3

The given line has a slope of -1/3 so anything parallel to that given line is also going to have an equal slope (of -1/3)

To find the slope of that line shown, notice how we drop down 1 unit and the move to the right 3 units when we go from the left point to the right point. Alternatively, you can use the slope formula m = (y2-y1)/(x2-x1) to get the same result.

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3 years ago

PLEASE HELP ME............THANKS

Stolb23 [73]

Answer:

i think it's c, I could be wrong djxndnxmmx

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3 years ago

Read 2 more answers

Help please and simply it

Elena-2011 [213]

-6, because -6^3 is -215

5 0

3 years ago