72 hours because if you keep counting up by NInes 8 times you will hit 72
$4.90 Each cake cost 0.70$ so 7x7=49 add the zero and move decimal one place to left
= 4.90$
-9y-9 simplification
-9y-9=0
-9y=9
y=-1
Thete is no question here, when the number of papers he delivers goes up his earnings also go up
