W(t) models the daily water level at a pond in Arizona, t days after the hottest day of the year. Here, t is entered in radians.

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W(t) models the daily water level at a pond in Arizona, t days after the hottest day of the year. Here, t is entered in radians.

W(t) = 15cos( 2π/ 3652 t)+43

What is the first time after the hottest day of the year that the water level is 30 cm

kikidylm Jan 28, 2019

edited by kikidylm Jan 28, 2019

CPhill · Answer 1 · 2019-01-28T08:29:45

I think the function might be

y =15 cos [ (2pi/365) t ] + 43

The water level is at a max at day 0 = 58 cm

The water level is at 30 cm about 153 days after this

I used x for t here :