"High tides at a beach occur at intervals of 12 h 25 min. Yesterday, high tide was measured at 5 ft above sea level and low tide was measured at 1 ft above sea level. What is the amplitude of a cosine function modeling the depth of the water in feet as a function of time in hours

13

Step-by-step explanation:

2

Step-by-step explanation:

you have to subtract 5-1 = 4

then you do: 4/2=2

(I just did this on a test and got it right)

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6

s

step-by-step explanation: