Please help me out here I need it

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Which is the best estimate of the product of 0.9 x 0.88? 0 0.25 0.5 1

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.