The following table compares the speed you drive in km/h to the fuel economy in km/L. Find the speed you need to travel to max your fuel economy.

Speed 24 32 40 48 56 64 72 80 89 97 105 113
Fuel Economy 9.48 10.84 11.69 12.33 12.24 12.75 12.71 12.84 12.92 12.24 11.65 10.76

Looks like 89 km/hr

how do you find the regression?

You review the section in your text. It shows how to do the job.

Or, use google to find any of a number of handy online regression calculators.

To find the speed at which you need to travel to maximize your fuel economy, you'll need to identify the highest fuel economy value from the given table.

Let's examine the given table and identify the maximum fuel economy value:

Speed Fuel Economy
24 9.48
32 10.84
40 11.69
48 12.33
56 12.24
64 12.75
72 12.71
80 12.84
89 12.92
97 12.24
105 11.65
113 10.76

By analyzing the fuel economy values, you can see that the highest value is 12.92, which corresponds to a speed of 89 km/h.

Therefore, to maximize your fuel economy, you need to travel at a speed of 89 km/h.