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Shalnov [3]
3 years ago
6

The school currently has 30 classrooms. With the addition, there will be 40 classrooms. What percentage of the current number of

classroom is the new number of classrooms? Round to the nearest percent.
Mathematics
1 answer:
stiv31 [10]3 years ago
6 0
The answer is 34%
30+33%=39.9
So round up two 34%
I hope that is right but I think the answer is 34%
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3 years ago
An element with a mass of 550 grams decays by 18.8% per minute. To the nearest minute, how long will it be until there are 60 gr
dmitriy555 [2]

Answer:  11

Step-by-step explanation:

Exponential Functions:

y=ab^x

y=ab  

x

 

a=\text{starting value = }550

a=starting value = 550

r=\text{rate = }18.8\% = 0.188

r=rate = 18.8%=0.188

\text{Exponential Decay:}

Exponential Decay:

b=1-r=1-0.188=0.812

b=1−r=1−0.188=0.812

\text{Write Exponential Function:}

Write Exponential Function:

y=550(0.812)^x

y=550(0.812)  

x

 

Put it all together

\text{Plug in y-value:}

Plug in y-value:

60=550(0.812)^x

60=550(0.812)  

x

 

\frac{60}{550}=\frac{550(0.812)^x}{550}

550

60

​  

=  

550

550(0.812)  

x

 

​  

 

Divide both sides by 550

0.109091=0.812^x

0.109091=0.812  

x

 

\log 0.109091=\log 0.812^x

log0.109091=log0.812  

x

 

Take the log of both sides

\log 0.109091=x\log 0.812

log0.109091=xlog0.812

use power rule to bring x to the front

\frac{\log 0.109091}{\log 0.812}=\frac{x\log 0.812}{\log 0.812}

log0.812

log0.109091

​  

=  

log0.812

xlog0.812

​  

 

Divide both sides by log(0.812)

10.638757=x

10.638757=x

x\approx 11

x≈11

5 0
4 years ago
Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.
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Answer:

3/8 might me ans

Step-by-step explanation:

12/33

6/16

3/8

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Answer:

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Step-by-step explanation:

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If 4 items are chosen at random without replacement from 7 items, in how many ways can the 4 items be arranged, treating each ar
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