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.

b = -7

and

b = -9

The dust particle has 400 times more mass than the pollen particle

Step-by-step explanation:

To answer this problem we use scientific notation.

We know that a number like:

0, 002

It can be written as:

Where 3 is the number of times the comma (,) must be run to the right to convert the quantity 0, 002 to 2.

0, 002

0| 0 0 2

0 0| 02 -----------1

0 0 0|2------------2

0 0 0 2| ----------3

Therefore, for the given expression:

Powder particle 0.000000778 g

It can be written as:

 0.0000008 g

b = -7

In the same way

Pollen grain 0.00000000155 g

It can be written as:

0.000000002 g

b = -9

To know how big is the mass of the dust particle with respect to the pollen divide:

The dust particle has 400 times more mass than the pollen particle

hi there!

the answer will be d: 2

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.