they are all perpendicular lines i made a graph on my paper and labled it with the coordinantes
Y intercept: when x = 0
Plug in x = 0
F(0) = -0^2 + 10(0) - 22
F(0) = 0 - 22
The y intercept is (0,-22)
To solve this we are going to use the half life equation
Where:
is the initial sample
is the time in years
is the half life of the substance
is the remainder quantity after
years
From the problem we know that:
Lets replace those values in our equation to find
:
We can conclude that after 1600 years of radioactive decay, the mass of the 100-gram sample will be
91.7 grams.
.8 grams
1000 mg = 1 g
That's why you do 800/1000 or 8/10