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2 years ago

If there was a total of 80 vehicles an a percentage of 70% of cars how much car was used

Mathematics

1 answer:

Korolek [52]2 years ago

4 0

Answer:

Step-by-step explanation:

I don't quite understand your question but I assumed you meant what is 70% of 80

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Round this number to the nearest tenth 4.253

Savatey [412]

The answer would be 4.300

Tip: If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up and if the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down.

3 0

2 years ago

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rehistoric cave paintings were discovered in a cave in France. The paint contained 34 % of the original carbon-14. Use the expo

Paladinen [302]

Answer:

Therefore the age of paint is 8915.78 years.

Step-by-step explanation:

Given that, the paint contain 34 % of the original carbon-14.

The exponential decay model for carbon-14 is

$A=A_0e^{-0.000121t}$

A= Remaining amount of carbon.

$A_0$ = initial amount of carbon.

Here A= 34% of $A_0$ $=\frac{34}{100}A_0$

$\therefore \frac{34}{100}A_0=A_0e^{-0.000121t}$

$\Rightarrow \frac{34}{100}=e^{-0.000121t}$

Taking ln both sides

$\Rightarrow ln|\frac{34}{100}|=ln|e^{-0.000121t}|$

$\Rightarrow ln|\frac{34}{100}|={-0.000121t$

$\Rightarrow t=\frac{ln|\frac{34}{100}|}{-0.000121}$

$\Rightarrow t= 8915.78$

Therefore the age of paint is 8915.78 years.

7 0

2 years ago

I need help with that one please

k0ka [10]

Your answers is correct Don’t worry good job

8 0

2 years ago

Explain the steps in calculating the mean absolute deviation of a set of data.

Anni [7]

Answer:

Step-by-step explanation:

Step 1: Calculate the mean.

Step 2: Calculate how far away each data point is from the mean using positive distances. These are called absolute deviations.

Step 3: Add those deviations together.

Step 4: Divide the sum by the number of data points.

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2 years ago

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Solve by factoring: x2 – 9x + 20 = 0

gayaneshka [121]

Answer:

Answer

Given equation is:

−9x+20=0

⇒x

−5x−4x+20=0

⇒(x−4)(x−5)=0

⇒x=4andx=5

3 0

2 years ago

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