The function f(t)= 7 cos((pi/4)t)+12 represents the tide in light sea. it has a maximum of 19 feet when time (t) is 0 and a minimum of 5 feet. the sea repeats this cycle every 8 hours. after 2 hours, how high is the tide?

The tide is 12 feet height at t=2.

Step-by-step explanation:

Given:

It is cosine function which represents the tide of light sea.

It has maximum of 19 feet at t=0

It has minimum of 5 feet at t=4

The sea repeats cycle every 8 hours. (Period = 8)

We need to find height of tide after 2 hours.

We will put t=2 into equation and solve for f(t)

Please see the attachment for graphical result.

Hence, The tide is 12 feet height at t=2.

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

~

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol