800
Because if you round 781 up to the nearest hundred, you would simply look at the number after the 7. If it is bigger than 5 then you round up
It will take her 8 weeks to have enough money for a bike. I made the equation 125+15x=245 and multiplied 15 by 8 to get exactly 245
1407.43cm³ V=πr2h=π·82·7≈1407.43351cm³
The one that doesnt belong is the 3 one