The level of the tide in a harbor changes from 813 8 1 3 feet to 256 2 5 6 feet above sea level over a period of 212 2 1 2 hours. What is the change in tide level per hour over this period of time? Feet per hour

-2.63 ft./hour

Step-by-step explanation:

The level of the tide in a harbor changes from 813 feet to 256 feet above sea level over a period of 212 hours. What is the change in tide level per hour over this period of time?

Solution:

The initial tide level was 813 feet while the final tide level was 256 feet above sea level within a period of 212 hours.

The change in tide level per hour is the ratio of the change in tide level to the period taken. Hence:

Change in tide level per hour = (Final tide level - initial tide level) / time taken

Change in tide level per hour = (256 ft. - 813 ft.) / 212 hours

Change in tide level per hour = -2.63 ft./hour

if you mean

then it's c. 8, -7/3

but if you mean

then it is

logv3(x+2)=1

rewrite in exponential form:

logb(x) = y is equal to b^y =x

b = 3, y = 1

now solve for x:

3^1 = x+2)

x = 3-2

x = 1

see the picture for the graph.