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Aleks [24]
2 years ago
9

a radioactive substance has a half-life of 2 seconds. A scientist begins with a sample of 20 grams. How much of the substance re

mains after 8 seconds?
Mathematics
1 answer:
s344n2d4d5 [400]2 years ago
5 0

Answer:

1.25 g

Step-by-step explanation:

you start with 20g at 0 seconds.

divide by half after 2 seconds and you have 10g.

at 4 seconds you have 5g.

at 6 seconds you have 2.5g.

at 8 seconds you have 1.25g.

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What is 12/39 in simplest form
Genrish500 [490]
<span>If you would like<span> to know what is </span>12/39 in simplest form, you can calculate this using the following step:<span>

12/39<span> simplifies to 4/13 (the common factor of 12 and 39 is 3, so you can divide both numbers by 3).</span>

<span>The result is 4/13.</span></span></span>
8 0
3 years ago
Read 2 more answers
In a race, Jane ran 3 minutes less than twice as many minutes as Mike ran. Write an expression to represent the number of minute
a_sh-v [17]

Answer:

n * 2 - 3

Step-by-step explanation:

Let's say n is the number of minutes Mike ran then the expression would be

n * 2 - 3

4 0
2 years ago
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The product of 4x and 0 is:<br> 4x<br> 4<br> 0
ki77a [65]

Answer: <em>0</em>

Step-by-step explanation:

<em>Simply the answer is </em><em>0</em><em> because anything multiplied by </em><em>0</em><em> will result in </em><em>0</em>

<em>4x(0) =</em><em> 0 </em>

7 0
3 years ago
Shen’s mother gave him $10 to go buy groceries. He picked up a gallon of milk for $3.49, three pounds of oranges that cost $1.14
svet-max [94.6K]
Gallon of milk: $3.49
3lbs oranges: $1.14(3) = $3.42
Box of cereal: $3.46

Front end estimation is taking the number in front and the rest of the numbers coming after it will be zeroes.

Using front end estimation:
$3.49 => $3.00
$3.42 => $3.00
$3.46 => $3.00

Add all these up; Shen estimated the total cost of the groceries would be $9.00.
5 0
3 years ago
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7. Given the following information, calculate, in order, the amount credited and the outstanding balance.
svp [43]

Answer:

C. $824.74, $175.26

Step-by-step explanation:

1) Amount Credited

The formula to calculate the amount credited =

Amount paid ÷ ( 100% - Discount)

Discount is given in the question as 3/10

Where 3 = Discount rate

Amount paid = $800

Amount credited = 800/( 100% - 3%)

= 800/ 97%

= 800/ 0.97

= $824.74

b) Outstanding balance = Invoice - Amount credited

Invoice = $1000

Amount credited = $824.74

Outstanding balance = $1000 - $824.74

= $175.26

5 0
3 years ago
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