brainly.com/question/5027087Let C, S and H be the diameters of cell, sand and hair
Diameter of a cell:

Diameter of a grain of sand:

Part A:

meters, because it takes 5 movements right of the decimal dot, until there is only one digit to its left.
Part B:
we are comparing

to

,

thus S is 20 times larger than C
Part C

thus,

Part D.

thus 300 nm are written in meters as follows:
Answer:
1.22 feet, or 1 11/50 ft
Step-by-step explanation:
Find 1/25 th of 30 1/2 feet:
1 61 ft
----- * ---------- = 1.22 feet, or 1 11/50 ft
25 2
The length of the model is 1.22 feet, or 1 11/50 ft