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3 years ago

12 times what equals 360?

Mathematics

2 answers:

REY [17]3 years ago

8 0

30*12=360. hope this helps.

creativ13 [48]3 years ago

3 0

The answer is 30. 360/12.

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REY [17]

Answer:

85 degrees

Step-by-step explanation:

Theses angles are the same because its parallell

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3 years ago

If mints sell three for 25°, how many can 1 buy with a $20 bill?

just olya [345]

Answer:

240

Step-by-step explanation:

20/0.25 = 80

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3 years ago

4. The mode of the following data set is 15, 16, 17, 23. 11, 19, 20, 15, 18, 22. 15, 19

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3 years ago

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Each pail of plaster covers 90 square feet of ceiling. What is the least number of plaster you would need to buy to cover the ce

denpristay [2]

You would need 3 pails of plaster, specifically about 2 pails and a fifth of another but you cant buy a fraction of a pail, so 3 pails are needed.

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3 years ago

The amount A of the radioactive element radium in a sample decays at a rate proportional to the amount of radium present. Given

slavikrds [6]

Answer:

a) $\frac{dm}{dt} = -k\cdot m$ , b) $m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$ , c) $m(t) = 10\cdot e^{-\frac{t}{2438.155} }$ , d) $m(300) \approx 8.842\,g$

Step-by-step explanation:

a) Let assume an initial mass m decaying at a constant rate k throughout time, the differential equation is:

$\frac{dm}{dt} = -k\cdot m$

b) The general solution is found after separating variables and integrating each sides:

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$

Where $\tau$ is the time constant and $k = \frac{1}{\tau}$

c) The time constant is:

$\tau = \frac{1690\,yr}{\ln 2}$

$\tau = 2438.155\,yr$

The particular solution of the differential equation is:

$m(t) = 10\cdot e^{-\frac{t}{2438.155} }$

d) The amount of radium after 300 years is:

$m(300) \approx 8.842\,g$

4 0

3 years ago

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