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Mathematics 9 Online
OpenStudy (pottersheep):

Pleaseeee help with trig graphs question (tides).

OpenStudy (pottersheep):

The water depth in a harbour is 21 m high tide and 11 m low tide. Each cycle is 12 hours. I figured out the equation based on a graph they gave us. The equation is D(t) = 5sin30(t-5) + 16 Now I don't know how to solve this question... Estimate the times at which the depth was at a) 14m. b) at least 18 m. Pleasee help~~

OpenStudy (pottersheep):

i just need to sub things into places right?? I dont know how ahh

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