with certain types of diseae. Ants injects a patient with a drug that is attract
ID: 2913181 • Letter: W
Question
with certain types of diseae. Ants injects a patient with a drug that is attracted to the diseased cells. The d cells are then exposed to red lightfase laser. This procedure targets and des diseased cells while limiting damage tos surrounding healthy tissue. The drug remains in the normal cells of the boo must be bleached out by exposure to the sun. A patient must be exposed to the s for 30 s on the first day, and then increase the exposure by 30 s every day until a total of 30 min is reached. 12. Photodynamic therapy is used in pati octor diseased from a estro y and un a) Write the first five terms of the sequence of sun exposure times b) Is the sequence arithmetic or geometric? c) How many days are required to reach the goal of 30 min of exposure to the sun? d) What is the total number of minutes of sun exposure when a patient reaches the 30 min goal?Explanation / Answer
a) 1st term = 30
2nd term = 30 + 30 = 60
3rd term = 60 + 30 = 90
4th term = 90 + 30 = 120
5th term = 120 + 30 = 150
b) it is a arithmetic sequence as there is a constant difference between each term
c) 30 min = 1800 sec
plugging An = 1800
An = a1 + ( n -1 ) d
1800 = 30 + ( n -1 ) 30
1800 - 30 = 30 ( n -1 )
n = 60
so, 60 days are required to reach 30 min exposure to the sun
d) finding sum upto 60 days
S60 = 60/2 [ 2 * 30 + ( 60 - 1 ) 30 ]
S60 = 54900
converting to minutes
54900/ 60
= 915
so, 915 total minutes of sun exposure when patient reches 30 min goal
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