A riverboat travels at an average of 14 km per hour in still water. The riverboat travels 130 km east up the Ohio River and 130 km west down the Ohio River in a total of 19.5 hours. To the nearest tenth of a kilometer per hour, what was the speed of the current of the river?

In a circle, a 45° sector has an area of 32π cm2. what is the radius of this circle? 32 cm 12 cm 16 cm 8 cm

You are cycling around europe with friends. you book into a hostel and you ask the owner what the ratio of men to women is currently staying there. there are 24 men and 6 women. what is the ratio of men to women in its simplest form?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?