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Phoenix [80]
3 years ago
7

Solve the inequality. -2(2x + 2) ≥ −4x − 12

Mathematics
1 answer:
777dan777 [17]3 years ago
8 0

Step-by-step explanation:

-

- 4x  - 4 \geqslant  - 4x - 12 \\  - 4x + 4x \geqslant  - 12 + 4 \\ 0 \geqslant  - 8

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A common inhabitant of human intestines is the bacterium Escherichia coli. A cell of this bacterium in a nutrient-broth medium d
nikitadnepr [17]

Answer:

a) k=2.08 1/hour

b) The exponential growth model can be written as:

P(t)=Ce^{kt}

c) 977,435,644 cells

d) 2.033 billions cells per hour.

e) 2.81 hours.

Step-by-step explanation:

We have a model of exponential growth.

We know that the population duplicates every 20 minutes (t=0.33).

The initial population is P(t=0)=58.

The exponential growth model can be written as:

P(t)=Ce^{kt}

For t=0, we have:

P(0)=Ce^0=C=58

If we use the duplication time, we have:

P(t+0.33)=2P(t)\\\\58e^{k(t+0.33)}=2\cdot58e^{kt}\\\\e^{0.33k}=2\\\\0.33k=ln(2)\\\\k=ln(2)/0.33=2.08

Then, we have the model as:

P(t)=58e^{2.08t}

The relative growth rate (RGR) is defined, if P is the population and t the time, as:

RGR=\dfrac{1}{P}\dfrac{dP}{dt}=k

In this case, the RGR is k=2.08 1/h.

After 8 hours, we will have:

P(8)=58e^{2.08\cdot8}=58e^{16.64}=58\cdot 16,852,338= 977,435,644

The rate of growth can be calculated as dP/dt and is:

dP/dt=58[2.08\cdot e^{2.08t}]=120.64e^2.08t=2.08P(t)

For t=8, the rate of growth is:

dP/dt(8)=2.08P(8)=2.08\cdot 977,435,644 = 2,033,066,140

(2.033 billions cells per hour).

We can calculate when the population will reach 20,000 cells as:

P(t)=20,000\\\\58e^{2.08t}=20,000\\\\e^{2.08t}=20,000/58\approx344.827\\\\2.08t=ln(344.827)\approx5.843\\\\t=5.843/2.08\approx2.81

3 0
3 years ago
What is the degree of angle e and g
Zina [86]

Answer:

e=g = 126 degree

Step-by-step explanation:

e = g (opposite angles's property)

g+ b = 180 ( supplementary angles's property)

b = 54 degree (opposite angles's property)

-> g = 180-54 = 126

-> e = 126 degree

3 0
3 years ago
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egoroff_w [7]

Answer:

.3

Step-by-step explanation:

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3 years ago
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Burka [1]

Answer:

Step-by-step explanation:

-1

6 0
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Help need to pass class and iready
BartSMP [9]

Answer:

  • \Large\boxed{\sf{y > 32}}

Step-by-step explanation:

To get the final answer, isolate the variable y on one side of the equation.

<h3>1/4y≥8</h3>

First, multiply by 4 from both sides.

\Longrightarrow: \sf{4*\dfrac{1}{4}y\geq 8*4 }

Solve.

8*4=32

\boxed{\sf{y\geq 32}}

  • <u>Therefore, the correct answer is D.</u>

I hope this helps, let me know if you have any questions.

8 0
3 years ago
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