It’s the second one because it can’t be half but it can be 1/4 and if you do the measurements you can tell it is the second one
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:
x = 25
Step-by-step explanation:
2/5x - 1 = 9
Add 1 to both sides
2/5x = 10
Multiply by 5 on both sides
2x = 50
Divide by 2 on both sides
x = 25
Check the answer:
Plug in 25 for x
2/5(25) - 1 = 9
10 - 1 = 9
9 = 9
The answer is correct.
Given:
The initial mass of an element is 800 grams.
Decay rate = 8.2% per day
Number of days = 15
To find:
The remaining element after 15 days.
Solution:
The exponential decay model is
Where, a is the initial value r is the rate of interest and t is time period.
Putting in the above formula, we get
Therefore, the mass of the remaining element is 221.7 grams.