Step 1: Write out the form of the equation of the table given
The equation of the line is a linear function with the form

Step 2: Plot the graph to get the value of a and b
From the graph above

Step 3: Write out the line of best fit by substituting the values of a and b

Step 4: Predict the weight of a sand shark whose length is 75 inches

Hence, the weight of a sand shark whose length is 75 inches is approximately 171