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ira [324]
3 years ago
15

The number seven help please

Mathematics
1 answer:
timurjin [86]3 years ago
8 0

Answer:

The answer is D

Step-by-step explanation:

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The enrolment of our school is 800. If 35 % are girls
Anvisha [2.4K]

Answer:

a 7/20. B 13/20

Step-by-step explanation:

800 X 35% = 280

280/800=7/20

6 0
2 years ago
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A freshly inoculated bacterial culture of Streptococcus contains 100 cells. When the culture is checked 60 minutes later, it is
Luba_88 [7]

Answer:

P(t) = 100e^{0.0251t}

The doubling time is of 27.65 minutes.

Step-by-step explanation:

Exponential equation of growth:

The exponential equation for population growth is given by:

P(t) = P(0)e^{kt}

In which P(0) is the initial value and k is the growth rate.

A freshly inoculated bacterial culture of Streptococcus contains 100 cells.

This means that P(0) = 100. So

P(t) = 100e^{kt}

When the culture is checked 60 minutes later, it is determined that there are 450 cells present.

This means that P(60) = 450, and we use this to find k. So

450 = 100e^{60k}

e^{60k} = 4.5

\ln{e^{60k}} = \ln{4.5}

60k = \ln{4.5}

k = \frac{\ln{4.5}}{60}

k = 0.0251

So

P(t) = 100e^{0.0251t}

Doubling time:

This is t for which P(t) = 2P(0) = 200. So

200 = 100e^{0.0251t}

e^{0.0251t} = 2

\ln{e^{0.0251t}} = \ln{2}

0.0251t = \ln{2}

t = \frac{\ln{2}}{0.0251}

t = 27.65

The doubling time is of 27.65 minutes.

7 0
3 years ago
5x+3(3x−43)=............
Anvisha [2.4K]
14x - 129 (I think I’m so sorry if it’s wrong)
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3 years ago
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What is the slope of the line passing through the point A and B, as shown on the graph below
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Answer:

We do not see the image

Step-by-step explanation:

8 0
2 years ago
Angie got some money for his birthday. He spent 1/5 of it on dog treats for his puppy. Then he divided the remainder equally amo
prohojiy [21]

Answer:

225

Step-by-step explanation:

60 x 3 = 180  ($60 for each charity and there's 3 charities)

180 / (4/5) = 225  (if $180 is four fifths of his total just divide 180 by 4/5 to get the answer)

3 0
3 years ago
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