"john and two friends rent a canoe at a park. each person much rent a life jacket. if the bill for the rental of the canoe and life jackets is $41, how many hours did they rent the canoe? " i have no idea if this question even has enough information.

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.