So (√567892)*45/6^3
use pemdas
simplify √567892= 2√141973
then 6^3
6^3=216
then multilication
( 2√141973) times 45= 90√141973
then division
(90√141973)/216=(5√141973)/12
She would pay $145 monthly
1600+5%(80)+60=$1740:12=145
You can do this by cross multiplying
1.4 hours
It took a while to get this one, and I must admit, I'm not the best at explaining anything so I'm simply going to leave the answer above to help those who are stuck.