13. Tides are measured by the heights of the tide above or below sea level. The difference between the two heights represents how much greater the high tide is than the low tide. The
table shows the high and low tides and the difference between their heights at each of three
locations. Some of the data in the table is missing
Tide Heights and Differences in Feet
Location High Tide
Low Tide
Difference
Between High
and Low Tides
P
8.53
0.63
?
Q.
6.98
-0.94
7.92
R
2
I
-1.02
6.75
a. Find the difference between High and Low Tides at location P. Show Your work