Last week you worked 21 hours and had $107.70 left after paying your bills. This week, you worked 17 hours and had $72.90 left after paying your bills. How much are your bills

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)

2/3=10/15

1/5=3/15

10+3=13/15

2 13/15 is the answer