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2 years ago

A student can solve 20 problems in 30 minutes. How long would it take him to solve 50 problems? Answer fast please.

Mathematics

2 answers:

stiks02 [169]2 years ago

7 0

The answer will be 60

anzhelika [568]2 years ago

6 0

Answer:

1 hour 15 minutes

Step-by-step explanation:

20 questions is 30 minutes

40 questions is 1 hour

10 questions 15 minutes because half of 20 question is 10 so half of 30 minutes is 15 minutes

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Plutonium-240 decays according to the function L where o

PIT_PIT [208]

Answer:

$\boxed{\textbf{1700 yr}}$

Step-by-step explanation:

$-\dfrac{\text{d}L}{\text{d}t} = kL\\\\\dfrac{dL}{L}=-kdt\\\\\ln L = -kt + C\\\text{At t = 0, L = L$_{0}$, so C = $\ln L_{0}$}\\\ln L = -kt + \ln L_{0}\\\ln L_{0} - \ln L = kt\\\\\ln \dfrac{L_{0}}{L} =kt$

Data:

L₀ = 24 g

L = 20 g

k = 0.000 11 yr⁻¹

Calculation:

$\ln \dfrac{24}{20} =0.000 11t\\\\\ln 1.2 = 0.000 11t\\\\0.1823 = 0.000 11t\\\\t = \dfrac{0.1823}{0.000 11} = \textbf{1700 yr}\\\\\text{It will take } \boxed{\textbf{1700 yr}}\text{ for the polonium to decay to 20 g}$

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2 years ago

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allsm [11]

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2 years ago

Stacy was born in 1996.When she was, her brother was 7. What year was her brother born

Tasya [4]

Answer:

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Step-by-step explanation:

Since the brother was 7 when Stacy was born in 1996, all you have to do is subtract 7 from 1996 to get 1989 because thats when the brother would be zero years of age.

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