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pochemuha
4 years ago
10

A first order decomposition reaction has a half-life of 64yr. What percentage of the original amount is left after 135years. (gi

ve answer to 1 decimal place)?
Mathematics
1 answer:
vlabodo [156]4 years ago
4 0

Answer:

23.2%

Step-by-step explanation:

First we need to find how many half lives 135 years is:

135 ÷ 64 = 2.109375

Now we divide 100% by 2 to the power of the number of half lives. This is how you calculate the percentage of the original amount left. If you have the original mass, you can substitute that in instead of 100%:

100 ÷ 2^{2.109375} = 23.1747390635

To 1 decimal place it is 23.2%

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dangina [55]

Where did you get that A and B? I could answer if you were much more precise.

8 0
4 years ago
There are 15 pieces of fruit in a bowl and 9 of them are apples. What percentage of the pieces of fruit in the bowl are apples?
Rufina [12.5K]

Answer:

Step-by-step explanation:

Using

Part/whole =%/100

%=part*100/whole

%=9*100/15

%=60%

60% of the fruits are apples

8 0
3 years ago
eduardo baked 150 muffins 1/5 of the muffins are banana 1/2 of the muffins are blueberry the rest are strawberry, how many muffi
marissa [1.9K]

Answer:

45 strawberry muffins

Step-by-step explanation:

In order to solve this equation you are going to have to multiply 150 by 1/5 bananas and 1/2 blueberry in order to get how much strawberry muffins were made. So first we are going to convert 1/5 and 1/2 into decimals:

1/5 = 0.2

1/2 = 0.5

Now we are going to multiply 0.2 and 0.5 by 150 in order to figure out how much banana and Blueberry muffins were made:

0.2 * 150 = 30

0.5 * 150 = 75

So 30 banana muffins were made and 75 blueberry muffins were made, now that we know this we are going to add 30 and 75 together and subtract the answer from 150. THe reason we are subtracting 75 + 30 from 150 is because we are trying to segregate the strawberry muffins from the total number:

75 + 30 = 105

now we subtract:

150 - 105 = 45

So the number of strawberry muffins made was 45.

I hope this helps.

3 0
3 years ago
Read 2 more answers
How does t-statistic differ from z-score? Select one:
marissa [1.9K]

Answer:

Option c

Step-by-step explanation:

In Statistics, both t and z tests are used for testing of hypothesis.

Whenever we have sample sizes >30 and when we know population std deviation sigma, we use Z test.

i.e. if sigma is known, we check whether sample size >30 then we use z test

Otherwise if population std deviation is not known, we use t test.  

Even if population std deviation is known, if n <30 we use t test. Both use the same formula for std error.

Hence the correct option is option c.

4 0
4 years ago
Calculate the volume of the image (easy)
4vir4ik [10]
V=1/3Bh B=area of base h=height
4 0
3 years ago
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