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crimeas [40]
3 years ago
11

What is 4 and 2/5 multiplied by 16.5

Mathematics
1 answer:
iren [92.7K]3 years ago
7 0

Method 1:

4\dfrac{2}{5}=4\dfrac{2\cdot2}{5\cdot2}=4\dfrac{4}{10}=4.4\\\\4\dfrac{2}{5}\cdot16.5=4.4\cdot16.5=72.6


Method 2:

16.5=\dfrac{165}{10}=\dfrac{165:5}{10:5}=\dfrac{33}{2}\\\\4\dfrac{2}{5}=\dfrac{4\cdot5+2}{5}=\dfrac{22}{5}\\\\4\dfrac{2}{5}\cdot16.5=\dfrac{22}{5}\cdot\dfrac{33}{2}=\dfrac{11}{5}\cdot\dfrac{33}{1}=\dfrac{363}{5}=72\dfrac{3}{5}

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4 0
3 years ago
Please somebody help need an answer
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3 years ago
Situation:
FromTheMoon [43]

Answer:

5.6 days

Step-by-step explanation:

We are given;

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Mass at time(t); N_t = 25/2 = 12.5 (I divide by 2 because we are dealing with half life)

k = 0.1229

Formula is given as;

N_t = N_o•e^(-kt)

Plugging in the relevant values;

12.5 = 25 × e^(-0.1229t)

e^(-0.1229t) = 12.5/25

e^(-0.1229t) = 0.5

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t = -0.6931/-0.1229

t = 5.6 days

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