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Olin [163]
3 years ago
8

What is the simplified expression of 5(3m+7) - 4?

Mathematics
2 answers:
Misha Larkins [42]3 years ago
5 0

Answer:

15m +31

Step-by-step explanation:

5(3m+7) - 4 = 15m + 35 - 4 = 15m +31

Mademuasel [1]3 years ago
4 0
15m+31
use distributive property to get 5x3m= 15m and 5x7=35. Now the equation is 15m+35-4. Your final answer is 15m+31! :)
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astra-53 [7]

Answer: 70-27x = 50-20x

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Need help on this problem
faust18 [17]

Using an exponential function, it is found that:

  • For Country A, the doubling time is of 43 years.
  • For Country B, the growth rate is of 1.9% per year.

<h3>What is the exponential function for population growth?</h3>

The exponential function for population growth is given as follows:

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

In which:

  • P(t) is the population after t years.
  • P(0) is the initial population.
  • k is the exponential growth rate, as a decimal.
  • t is the time in years.

For Country A, we have that k = 0.016. The doubling time is t for which P(t) = 2P(0), hence:

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

2P(0) = P(0)e^{0.016t}

e^{0.016t} = 2

\ln{e^{0.016t}} = \ln{2}

0.016t = \ln{2}

t = \frac{\ln{2}}{0.016}

t = 43 years.

For Country B, P(36) = 2P(0), hence we have to solve for k to find the growth rate.

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

2P(0) = P(0)e^{36k}

e^{36k} = 2

\ln{e^{36k}} = \ln{2}

36k = \ln{2}

k = \frac{\ln{2}}{36}

k = 0.019.

For Country B, the growth rate is of 1.9% per year.

More can be learned about exponential functions at brainly.com/question/25537936

#SPJ1

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2 years ago
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mihalych1998 [28]

Answer:

8in

Step-by-step explanation:

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2 years ago
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Firlakuza [10]

Answer:

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Step-by-step explanation:

You can just multiply 21 by 1.2 because that's how long she takes per lap and you can get 25.2

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