Diffusion of information. Pharmaceutical firms invest significantly in testing new medications. After a drug is approved by the Federal Drug Administration, it still takes time for physicians to fully accept and start prescribing it. The acceptance by physicians approaches a limiting value of 100%, or 1, after t months. Suppose that the percentage P of physicians prescribing a new cancer medication after t months is approximated by P ( t ) = 100 ( 1 − e − 0.4 t ) . 0%, 33%, 55%, 70%, 86%, 99.2%, 99.8% a. What percentage of doctors are prescribing the medication after 0 months? 1 month? 2 month? 3 months? 5 months? 12 months? 16 months? b. Find P ' ( 7 ) , and interpret its meaning. c. Sketch a graph of the function.
Diffusion of information. Pharmaceutical firms invest significantly in testing new medications. After a drug is approved by the Federal Drug Administration, it still takes time for physicians to fully accept and start prescribing it. The acceptance by physicians approaches a limiting value of 100%, or 1, after t months. Suppose that the percentage P of physicians prescribing a new cancer medication after t months is approximated by P ( t ) = 100 ( 1 − e − 0.4 t ) . 0%, 33%, 55%, 70%, 86%, 99.2%, 99.8% a. What percentage of doctors are prescribing the medication after 0 months? 1 month? 2 month? 3 months? 5 months? 12 months? 16 months? b. Find P ' ( 7 ) , and interpret its meaning. c. Sketch a graph of the function.
Solution Summary: The author calculates the percentage of doctors that are prescribing a new cancer medication after 0month of FDA approval.
Diffusion of information. Pharmaceutical firms invest significantly in testing new medications. After a drug is approved by the Federal Drug Administration, it still takes time for physicians to fully accept and start prescribing it. The acceptance by physicians approaches a limiting value of 100%, or 1, after t months. Suppose that the percentage P of physicians prescribing a new cancer medication after t months is approximated by
P
(
t
)
=
100
(
1
−
e
−
0.4
t
)
.
0%, 33%, 55%, 70%, 86%, 99.2%, 99.8%
a. What percentage of doctors are prescribing the medication after 0 months? 1 month? 2 month? 3 months? 5 months? 12 months? 16 months?
Question 2
Let F be a solenoidal vector field, suppose V × F = (-8xy + 12z², −9x² + 4y² + 9z², 6y²), and let
(P,Q,R) = V²F(.725, —.283, 1.73). Then the value of sin(2P) + sin(3Q) + sin(4R) is
-2.024
1.391
0.186
-0.994
-2.053
-0.647
-0.588
-1.851
1 pts
1 pts
Let F and G be vector fields such that ▼ × F(0, 0, 0) = (0.76, -9.78, 3.29), G(0, 0, 0) = (−3.99, 6.15, 2.94), and
G is irrotational. Then sin(5V (F × G)) at (0, 0, 0) is
Question 1
-0.246
0.072
-0.934
0.478
-0.914
-0.855
0.710
0.262
.
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