Probably Olivia because the way they chose the people they interviewed was the most random
Answer:Let's look at what's happening to the x and y coordinates.
x1 is 1, and x2 is -1. The difference between them is 2. x is decreasing by 2. Therefore, the first part of our answer is x-2.
How, y1 is 3 and y2 is 4. This is increasing by 1.
So, our answer is (x-2,y+1)
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Answer:
The half life of a material is the time that a given quantity A of the material, decays into its half.
We know that the half-life is 4 hours, then we have the equation:
Q(t) = A*r^t
Where A is the initial quantity, and t is the number of hours.
and we have that r^4 = 1/2 (so when t = 4, we will have half of A)
then r = (1/2)^(1/4) = 0.84
Then our relation is
Q(t) = A*0.84^t
We have that A = 225mg,
at 1:00 pm. we have one hour after noon, so here we need to use t = 1.
Q(1) = 225mg*0.84^1 = 189.2mg
At 7:00 pm, we have 7 hours since noon, so here we need to use t = 7
Q(7) = 225mg*0.84^7 = 66.4mg