SOLUTION: Variable stars are ones whose brightness varies periodically. The brightness of a certain star is modeled by the function b(t) = 8.1 − 2.2 cos (pi/155)t ---- Not clear. C

Algebra ->  Trigonometry-basics -> SOLUTION: Variable stars are ones whose brightness varies periodically. The brightness of a certain star is modeled by the function b(t) = 8.1 − 2.2 cos (pi/155)t ---- Not clear. C      Log On


   



Question 997592: Variable stars are ones whose brightness varies periodically. The brightness of a certain star is modeled by the function
b(t) = 8.1 − 2.2 cos (pi/155)t
----
Not clear.
Clarify the cosine.

where t is measured in days.
(a) Find the period.

days
(b) Find the maximum and minimum brightness.

(minimum)

(maximum)
(c) Graph the function b.

Answer by Alan3354(69443) About Me  (Show Source):
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Variable stars are ones whose brightness varies periodically. The brightness of a certain star is modeled by the function
b(t) = 8.1 − 2.2 cos (pi/155)t
----
Not clear.
Clarify the cosine.
pi/155 is a constant.

where t is measured in days.
(a) Find the period.

days
(b) Find the maximum and minimum brightness.

(minimum)

(maximum)
(c) Graph the function b.