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3 years ago

Which figure is a pyramid?

Mathematics

2 answers:

Effectus [21]3 years ago

6 0

Answer:

the top one because it is even

Step-by-step explanation:

MakcuM [25]3 years ago

4 0

Answer:

the first one is a pyramid

hope it helps!

please mark as the brainliest!

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3 years ago

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A tank is filled with 1000 liters of pure water. Brine containing 0.04 kg of salt per liter enters the tank at 9 liters per minu

klemol [59]

Answer:

The differential equation which describes the mixing process is $\frac{dc_{salt,out}}{dt} + \frac{2}{125}\cdot c_{salt,out} = \frac{71}{100000}$ .

Step-by-step explanation:

The mixing process within the tank is modelled after the Principle of Mass Conservation, which states that:

$\dot m_{salt,in} - \dot m_{salt,out} = \frac{dm_{tank}}{dt}$

Physically speaking, mass flow of salt is equal to the product of volume flow of water and salt concentration. Then:

$\dot V_{water, in, 1}\cdot c_{salt, in,1} + \dot V_{water, in, 2} \cdot c_{salt,in, 2} - \dot V_{water, out}\cdot c_{salt, out} = V_{tank}\cdot \frac{dc_{salt,out}}{dt}$

Given that $\dot V_{water, in, 1} = 9\,\frac{L}{min}$ , $\dot V_{water, in, 2} = 7\,\frac{L}{min}$ , $c_{salt,in,1} = 0.04\,\frac{kg}{L}$ , $c_{salt, in, 2} = 0.05\,\frac{kg}{L}$ , $\dot V_{water, out} = 16\,\frac{L}{min}$ and $V_{tank} = 1000\,L$ , the differential equation that describes the system is:

$0.71 - 16\cdot c_{salt,out} = 1000\cdot \frac{dc_{salt,out}}{dt}$

$1000\cdot \frac{dc_{salt, out}}{dt} + 16\cdot c_{salt, out} = 0.71$

$\frac{dc_{salt,out}}{dt} + \frac{2}{125}\cdot c_{salt,out} = \frac{71}{100000}$

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3 years ago

What is the constant of proportionality of a graph if x equals 3 and y equals 90?

solmaris [256]

y = kx

'k' is the constant of proportionality, or otherwise known as constant of variation.

y = 90
x = 3

90 = k(3)
90 = 3k
3k/3 = 90/3
k = 30

The constant of proportionality is 30.

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3 years ago

How is factoring related to using the distributive property

xeze [42]

In the above statement, the number 3 is a common factor between the two terms in the statement, 3x and 3y. We can divide 3 into both numbers evenly. This is also called “factoring out” 3. Finding the common factor allows us to apply the Distributive Property to the statement.
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4 years ago

Which figure is a pyramid?​

Which figure is a pyramid?