Lena is playing her accordion by compressing and stretching it. The accordion's length (in cm) t seconds
after it's completely stretched is modeled by A(t). Here, t is entered in radians.
A(t) = 25 cos (Tt) + 65
How long does it take Lena to compress the accordion completely and then stretch it back out to a length
of 50 cm?
Round your final answer to the nearest tenth of a second.

It takes Lena 4.1 seconds to compress the accordion completely and then stretch it back out to a length  of 50cm.

Step-by-step explanation:

I am assuming the function without a T: .

The function is graphed in the figure attached, and the blue line is .

From the graph we see that the accordion is completely stretched  (has minimum length) at seconds, and stretches back  to 50cm at ; therefore, it takes Lena 4.069 seconds to stretch the accordion back again, which to the nearest tenth of a second is  4.1s

1.3 is the correct answer.

Step-by-step explanation:

sorry, i can't understand your question. will later if you describe more clearly!

: )

step-by-step explanation: