Help!! arithmetic sequences 1).35,_,_,_,19

2)11,_,_,_,-26

3)-34,_,_,-16

4)23,_,_,_,31

5)2,_,_,_,_,57

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.

Who ever answers this will get a cookie from batman