Question

The function f(t) = 3 cos(pi over 6t) + 5 represents the tide in Blastic Sea. It has a maximum of 8 feet when time (t) is 0 and a minimum of 2 feet. The sea repeats this cycle every 12 hours. After nine hours, how high is the tide?

12 feet

5 feet

4.5 feet

2.5 feet

Answer 1

let t=9 ....

Answer 2

and i believe its not 'over 6t' but 'over 6' then times t

Answer 3

here ill right out what it looks like before i start to work it out

Answer 4

\[f(t) = 3\cos(\frac{ \pi }{ 6 })+5\]

Answer 5

supposed tobe a t in the parenthesis

Answer 6

\[f(t) = 3\cos(\frac{ \pi }{ 6 }t)+5\]or
\[f(t) = 3\cos(\frac{ \pi }{ 6t})+5\]

Answer 7

first one

Answer 8

at any rate, let t=9 and the solution just solves itself

Answer 9

k one sec

Answer 10

i got 5 feet

Answer 11

5 it is then

Answer 12

thank you

Answer 13

yw