3 years ago

What is madeline mistake

Mathematics

1 answer:

Mazyrski [523]3 years ago

8 0

Answer:

4000 should be 40 to be correct. simple wrong steps.

Step-by-step explanation:

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kobusy [5.1K]

Answer:

2. -1/3x > 12

3. 5+x > 7

4.10-x < 30

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Step-by-step explanation:

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3 years ago

A rectangular prism has a length of 14 feet, a height of 11 feet, and a width of 13 feet. What is its volume, in cubic feet ?

Radda [10]

2002 ft^3. Hope this is right!

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2 years ago

Write number to make each line have the sum 7

DochEvi [55]

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3 years ago

Solve for x <br><br> -7(1-8x)=105

Sunny_sXe [5.5K]

-7 + 56x = 105
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4 years ago

The radioactive isotope radium has a half-life of 1,600 years. The mass of a 100-gram sample of radium will be______ grams after

Olenka [21]

To solve this we are going to use the half life equation $N(t)=N_{0} e^{( \frac{-0.693t}{t _{1/2} }) }$
Where:
$N_{0}$ is the initial sample
$t$ is the time in years
$t_{1/2}$ is the half life of the substance
$N(t)$ is the remainder quantity after $t$ years

From the problem we know that:
$N_{0} =100$
$t=200$
$t_{1/2} =1600$

Lets replace those values in our equation to find $N(t)$ :
$N(200) =100e^{( \frac{(-0.693)(200)}{1600}) }$
$N(200)=100e^{( \frac{-138.6}{1600} )}$
$N(200)=100e^{-0.086625}$
$N(200)=91.7$

We can conclude that after 1600 years of radioactive decay, the mass of the 100-gram sample will be 91.7 grams.

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3 years ago