Step-by-step explanation:

all the details are in the attachment.
Answer:
8
Step-by-step explanation:
3^2 = 9 - 1 = 8
I think it’s either 4 or 20
5 x 4 =20
6 x 4 =20
the easiest way is to make the fractions the same, with common denominators.
that means you have to multiply (1/4) by 2, to make it 2/8.
then you can see that she can make 3 total trips, not including driving back home.