Each half-life reduces a sample by one half.
So after 1 half-life there is 1/2 left
2 half-lives 1/4
3 half-lives 1/8
4 half-lives 1/16
5 half-lives 1/32
There would be (1/32) of 120 remaining.
or 3.75 grams.
Source:
http://www.1728.org/halflife.htm
first picture is 4 over 10
Answer:
24-8x
Step-by-step explanation:
<h3>
Answer: y = -3x+5</h3>
slope = -3
y intercept = 5
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Explanation:
The given line is in the form y = mx+b, so the slope is m = -3
Any parallel line to this one will also have the same slope, but a different y intercept.
Plug (x,y) = (-1,8) and m = -3 into y = mx+b so we can find new y intercept.
---------------------
y = mx+b
8 = -3(-1) + b
8 = 3+b
8-3 = b
5 = b
b = 5
So because m = -3 and b = 5, this means we have y = -3x+5 as our answer.
We know that
if <span>4 electricians can complete a job in 8 hours
then
</span>100% of a job -------> 8 hours
x------------------> 1 hour
x=100/8----> x=12.5%
divide by 4 electricians
12.5%/4-----> 3.125%
that means each electrician can complete 3.125% of a job in 1 hour
therefore
3 electricians-----> 3*3.125%----> 9.375% in 1 hour
so
9.375%-----------> 1 hour
100%--------------> x
x=100/9.375----> x=10.67 hours
the answer is
10.67 hours
