Ms. callahan had 250 sheets of paper. she used 6 sheets of paper. she then gave each student 3 sheets of paper. which expression represents the number of sheets of paper ms. callahan had left after she gave paper to n students> a) 250 - 9n b) 250 - 3n c) 250 - 9 - 3n d) 250 6 - 3n

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.