Question

The level of the tide in a harbor changed from 9 1/4 ft to 4 1/2 ft above sea level over a period of 3 1/4 hr

Answer 1

The answer is "
`\bold{- (19)/(13) \ / hour}`"

Explanation:

Please find the complete question in the attached file.

Calculating the difference of
`9 (1)/(4)\ and \ 4 (1)/(2)` dividing the value by
`3 (1)/(4)`

`\to 4 (1)/(2) - 9 (1)/(4)\\\\ \to (9)/(2) - (37)/(4)\\\\ \to (18-37)/(4) \\\\ \to -(19)/(4)\\\\\to -(19)/(4) / (13)/(4)= -(19)/(4) * (4)/(13) = -(19)/(13)\\`