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vitfil [10]
3 years ago
14

When doctors prescribe medicine, they must consider how the drug’s effectiveness declines as time passes. If each hour a drug is

only 90% as effective as the previous hour, at some point the patient will have to be given another dose in order for the drug to remain effective. If the initial dose was 500 mg and the drug was administered 6 hours ago, how long will it take for the initial dose to reach a level of 150 mg?
This is an example of
A) exponential growth.
B) exponential decay.
C) quadratic growth.
D) logistic decay.
Mathematics
2 answers:
ziro4ka [17]3 years ago
6 0

Answer:         B                 have a good day and good luck  ;]

Step-by-step explanation:

Pie3 years ago
5 0

Answer:

B)

Step-by-step explanation:

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Which of the following is the correct notation for the complex number 113-√-68?
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7 0
3 years ago
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Suppose that receiving stations​ X, Y, and Z are located on a coordinate plane at the points ​(3,3​), ​(-13​, −5​), and ​(-5​,3)
Aliun [14]
This problem will be solved both analytically and graphically.
The epicenter lies on a circle with radius=5 from X(3,3). Therefore
(x-3)² + (y-3)² = 25          (1)
Y(-13,-5) has the epicenter on a circle with radius=13, therefore
(x+13)² + (y+5)² = 169     (2)
Z (-5,3) has the epicenter on a circle with radius = 5, therefore
(x+5)² + (y-3)² = 25          (3)

Subtract (1) from (3).
(x+5)² - (x-3)² = 0
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x = -1
From (1), obtain
16 + (y-3)² = 25
(y-3)² = 9
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Check answers with (2).
When x=-1, y=0. obtain
(x+13)² + (y+5)² = 169 (Correct, Accept)
When x=-1, y=6, obtain
(x+13)² + (y+5)² = 265 (Incorrect, Reject)

The epicenter is at (-1,0).

Graphical solution (see the figure below).
From X (3,3), draw a circle with radius =5.
From Z (-5, 3), draw a circle with radius = 5.
The only point where all three circles intersect is (-1, 0) approximately.

Answer: The epicenter is at (-1,0)

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3 years ago
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