Answer:
...............................
Step-by-step explanation:
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Answer:
2.5 half-lives
Step-by-step explanation:
Find 
in 
given 
is the amount after the time 
, 
`is the initial amount, is the half-life
We know that after half-life there will be twice less the initial quantity:
.
Simplifying gives 
Plugging this into the initial equation, we obtain that 
or 
Finally, just plug in the given values and find the unknown one.
From 
, we have that 
= 
So you should get: 
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Answer:
You can make 27 different 3 digit numbers
Step-by-step explanation:
Since we can use 3 different numbers this means that each of the 3 digits can be one of the 3 numbers (4,2,9). This means that there are 3 different values for the first digit, 3 different values for the second digit, and 3 different values for the third digit, which mean that we can make 3 x 3 x 3 different 3 digit numbers (we took the number of possible values for each digit and multiplied them together.
3 x 3 x 3 = 27
It is only one line because a<span> set of points is collinear if they lie on a single straight line. This is very common to be applied in mathematics</span>
