How do u multiply fractions?

2 answers:

8 0

When you multiply fractions all you need to do is multiply straight like lets say you have the fractions 1/3*1/2you multiply as if you would multiply normally like first the dominators 1*1=1 and now the numerators 3*2=6 now we put them in order 1/6.
Hope it helps.

Gennadij [26K]4 years ago

4 0

Multiplying fractions is easier to understand than dividing fractions.A fraction has two parts: a numerator and a denominator. For example: 1/5. In this example 1 would be the numerator and 5 would be the denominator. To multiply fractions all you do is multiple the numerators together and the denominators together.
Ex.) 1/10 x 1/10= 1/100
In this example you multiplied 1 by 1 and put that as the numerator on you answer. Then you multiply 10 by 10 and that is the denominator for your answer. Let me know if you need another example.

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How many hours will it take a culture of bacteria to increase from 20 to 2000 if the growth rate per hour is 85%

Eddi Din [679]

So you are seeing how much time it'll take so you solve for "t", the time.
So you take the formula A=Pe^(rt) 
A=2000 because it's the end value 
P=20 because it's the starting value 
r=.85 since 85%=.85 and .85 is the rate 
Plug the values in and you get 2000=20e^(.85t) 
What you do is you divide by 20 so you get 100=e^(.85t) 
Take the natural logarithm of both sides 'cause of e and a natural log is written as ln so you get 
ln 100=.85t ln e and because you can use the power rule you end up with .85t ln e and 
ln e=1 so you have ln 100 = .85t so you divide by .85 so (ln 100)/.85=t and t=5.4178472776331 
hours 
3. Exponential decay: 
A= Pe^(rt) 
where 
A is the final amount 
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r is rate of decay 
t is time (years) 
Let's say x is the initial amount then (1/2)x=xe^(32r) 
I used x because the value isn't given but anyway division by x would give you 1/2=e^(32r) 
Take the ln of both sides so ln 1/2=32r ln e and then ln e=1 so ln 1/2=32r. 
Divide both sides by 32 and you'd get (ln 1/2)/32=r and r= -0.021660849392498 
4. Another depreciation question. 
Each year the item retains 88% of its last-year value. 
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8 0

3 years ago

What is 3 x 2 1/3 ? simplify HELP QUICKLY PLEASE HURRY UP!!!!

LuckyWell [14K]

Answer:

Your answer is 7

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4 years ago

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Murrr4er [49]

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