High tide occurs at intervals of 12.5 h. High tide measured 8.5 ft and low tide measured 2.5 ft. What is the amplitude of a cosine function modeling the depth of the water in feet as a function of time in hours?

47

step-by-step explanation:

my answer is$ 12

step-by-step explanation:

because 15 -2=12

3x + 4y -25 =0 represents the amount of change sianna should recieve

18 units²

step-by-step explanation:

first let's find altitude bd using the distance formula

d = √((y₂ - y₁)² + (x₂ - x₁)²)

bd = √((0 - -3)² + (0 - 3)²)

bd = √18

given the placement of points a and c, we can denote that point d bisects segment ac.

we will call ac the base.

using the distance formula

ac = √((0 - 6)² + (-6 - 0)²)

ac = √72

knowing our base and our height, we can plug these into our triangle area formula

area = (b * h)/2

area = (√18 * √72) / 2

area = (√1296) / 2

area = 36 / 2

area = 18 units²