9^2=81
-335
$0.32
because dependant on what you go on to do in life you may use it i understant you may not use them in specific but others will and they need to know it
you cant find a gcf of one number you need to have 2 numbers to find a gcf
you would pay $160 and save $40
4 is the answer
1
0.0512820512820513
0.0057971014492754
