(05.05)on the coordinate plane below, what is the length of ab?

a coordinate plane is shown with the following points a at negative 9, 4; b at 5, 4; c at 5, negative 5; d at negative 9, negative 5. all points are connected to create a rectangle.

8 units
9 units
14 units
15 units

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.