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kogti [31]
3 years ago
7

Strontium 90 is a radioactive material that decays according to the function

Mathematics
2 answers:
Julli [10]3 years ago
5 0

Answer:

decay rate is 2.44% per year

after 40 years, 400*(e^-0.976)=150.73 gm

300=400(e^-0.0244t)

0.75=e^-0.0244t

 

ln both sides

-0.2877=-0.0244t

t=11.79 years

t (1/2) occurs when ln(0.5)=-0.0244t

t=28.41 years

Have a nice day!

kifflom [539]3 years ago
3 0

Answer:

hey mate

the time required is 28.41 days

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Divide 7/24 by 35/48 and reduce the quotient to the lowest fraction
tiny-mole [99]
\frac{7}{24} ÷ \frac{35}{48}
Multiply \frac{7}{24} by the reciprocal of \frac{35}{48}, which is \frac{48}{35}

=\frac{7}{24} × \frac{48}{35}
=\frac{336}{840}

We can simplify it further:
The greatest common factor here is 168
\frac{336/168}{840/168}

=\frac{2}{5}
4 0
3 years ago
1 is 25% of what numder
allsm [11]

Answer:

4, it's obvious think of it as a quarter.

Step-by-step explanation:

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5 0
2 years ago
6.) A local flower shop is planting flowers to add beauty to the city park. They will plant 360
frozen [14]

Answer:

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Step-by-step explanation:

8 0
3 years ago
Urgent
Damm [24]

The result of our calculations about the rate and time are:

  • r=d/t
  • 200000m/hr
  • 200km/hr
  • km/hr

<h3>What is rate?</h3>

Rate can be regarded as the given object with respect to time.

falcon flies= 800,000 meters

t= 4 hours

We were given the  formula as (d = rt)

d= distance

r = rate

t = time

We can make our calculations as:

part a:

r=d/t

part b:

falcon's rate in meters per hour = 800,000 meters / 4 hours = 200000m/hr

part c:

falcon's rate in kilometers per hour=(200000m/hr *(1/1000)=200km/hr

part d:

km/hr

Learn more about rate at:

brainly.com/question/8728504

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4 0
2 years ago
Solve for 3/4u = 12<br> .<br> Simplify your answer as much as possible.
Wittaler [7]

Answer:

u = 16

Step-by-step explanation:

Given

\frac{3}{4} u = 12

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u = 16

6 0
3 years ago
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