The size of a germ .001 mm. What is this number written in scientific notation?

1*10^-3

Step-by-step explanation:

The number being multiplied by a power of 10 has to be between 1 and 10, and you have a number that is less than 10, so keep moving the decimal point to the right until the number being multiplied by a power of 10 is between 1 and 10.

You should get to 1 after moving to the decimal point to the right three places. When you shift the decimal point to the right, it means that the exponent raised to the base of 10 is going to be negative. Since you moved it three places, the power of 10 will be 10^-3. So the final answer is 1*10^-3

I'm sorry if I didn't explain this well; I am not the best at explaining. Hope this helps!

(a) the volume of the cone is 20/3 in3

hence, option a is correct.