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Leokris [45]
3 years ago
9

Give the domain, range, intercepts, asymptotes, intervals of increasing and decreasing, intervals of positive and negative, symm

etry and extrema (if any) for the graph of this equation.
3/x^2-4 + 1
Mathematics
1 answer:
klemol [59]3 years ago
3 0
y = \frac{3}{x^{2} - 4} + 1

Domain: x² - 4 ≠ 0
                 + 4 + 4
                    x² ≠ 4
                 √x² ≠ √4
                    x ≠ ±2
           x ≠ -2 and x ≠ 2
     (-∞, -2) ∨ (-2, 2) ∨ (2, ∞)

Range: y ≠ 1
    (-∞, 1) ∨ (1, ∞)

Intervals: Increasing: (0.25 , ∞)
              Decreasing: (-∞, 0.25)

Symmetry: X-axis: Not Symmetric
                  Y-axis: Not Symmetric
                  Origin: Not Symmteric

Extrema: Maximum Relative: x = 0
                Minimum Relative: Nothing
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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}

3 0
3 years ago
The movie started at 6:32 p.m. and ended at 9:48 p.m. How long did the movie last?
lapo4ka [179]
First, add hours until the difference is less than an hour. You can add 3 hours on to make it 9:32 p.m. Then, add minutes on until it's the exact time. from 9:32 to 9:48, you can add 16 minutes, so the total time in the movie was 3 hours, 16 minutes.
7 0
3 years ago
By what percent will the product of two numbers change, if the first number increases by 70%, while the second number decreases
erica [24]

Answer:

The product of two numbers changes by 2% when the first number increases by 70%, while the second number decreases by 40%.

Step-by-step explanation:

Let first number be x and second number be y .

Then product of x and y = xy  ......(1)

Given the first number increases by 70%, while the second number decreases by 40% this means,

x is increased  by 70%  that is

increased value of x = x + 0.7(x) = 1.7 x

Similarly y is decreases by 40% that is

decreased value of y = y - 0.4(y) = 0.6y

New product will be = (increased value of x )( decreased value of y)

                                  = (1.7x)(0.6y)

                                  =1.02xy

Changed Percentage = \dfrac{\text{new value - original value}}{{\text{original value}}}\times 100

Substitute the values, we get,

Changed Percentage = \frac{1.02xy-xy}{xy}\times 100

Changed Percentage = \frac{0.02xy}{xy}\times 100

Changed Percentage = 0.02\times 100

Changed Percentage = 2\%

Thus, the product of two numbers changes by 2% when the first number increases by 70%, while the second number decreases by 40%.

5 0
4 years ago
Una bolsa de 18 libras de comida para perros cuesta $27. ¿Cuál es la constante de proporcionalidad que relaciona el costo en dól
castortr0y [4]

Answer:

k=\frac{y}{x}= \frac{27}{18} = \frac{3}{2}= 1\frac{1}{2}

Step-by-step explanation:

5 0
3 years ago
17.16 is 62.4% of what number?
Step2247 [10]
17.16 is 62.4% of what number?

'is' indicates an equal sign.

62.4% = 0.624

'of' indicates multiplication

'what number' indicates an unknown value that we can call 'x'

17.16 = 0.624 * x

17.16 = 0.624x

Divide 0.624 to both sides:

x = 27.5
3 0
3 years ago
Read 2 more answers
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