If fg=3/4 miles and lm=1.5 miles then the scale factor for the dials toon is ?

Scale factor is 0.5

Explanation:
I will assume that:
LM is the original distance
FG is the dilated distance

The dilation can be found using the following the general rule:
dilated quantity = scale factor * original quantity

In the given, we have:
dilated distance = 0.75 miles
original distance = 1.5 miles

Substitute with the givens in the above equation to get the scale factor as follows:
0.75 = scale factor * 1.5
scale factor = 

Hope this helps :)