"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)

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!