A radioactive kind of nitrogen has a half-life of 10 minutes. If you start with 64 grams of the substance, how much will be left after 20 minutes

Answers

Answer 1

Answer: There would be 16 grams left after 20 minutes.
64/2 = after ten minutes
= 32
32/2 = after another ten minutes (20 full)
= 16

Answer 2

Answer:

Answer:

Step-by-step explanation:

First, find out how many half-lives have passed. Divide the number of minutes by the length of a half-life.

20÷10=2

2 half-lives have passed.

Now figure out how much nitrogen will be left after 2 half-lives have passed. Multiply the starting amount of nitrogen by

1/2

a total of 2 times.

120x1/2 1/2=30

That calculation could also be written with exponents:

120x(1/2)2=30

After 2 half-lives, the amount of nitrogen left will be 30 grams.

Related Questions

What number is 32% of 1,000?
There are 8 students on the minibus. Five of the students are boys. What fraction of the students are boys?
are there less than 1 million exactly 1 million or greater than 1 million milligrams in kilograms explain how you know
What is the range of the relation (-3,6),(5,2),(-1,-5),(6,-3)
Which answer correctly identifies the underlined words in the sentence? To travel to the moon would be a great adventure. A. participial phrase B. infinitive phrase C. infinitive D. participle

Can someone help me with this problem ? Thxs

Answers

The answer would be “B” because if she was twice as old as her cousin then you would do “2k=e-9
e=k+4

tiles of patterns is shown below. Consider function that represents the number of whithe in each figure.Figure 1Figure 2Figure 3Figure 4Select all statements that are true.

Answers

Call n the number of figure and w the number of white figures:

w = (n+2)^2 - n^2

w = n^2 + 4n + 4 - n^2 = 4n + 4

w = 4 (n+1)

All those formulas are equivalent.

The state of Utah covers 82144 square miles

Answers

cool fact but where's the question?

How many acute/obtuse/right angles does a pentagon have

Answers

5 obtuse no acute and no right

What is the perimeter of the inside of the track?use 3.14 for pie

Answers

r-radius
perimeter will be $2\pi r\approx2*3.14r=6.28r$

What is 3m + 4n - 6n

Answers

Simple,

3m+4n-6n

Simplify your variables....

4n-6n= -2n

Thus,

3m-2n.

That's it, it's simplified...done...out of here...

Thus, your answer is, 3m-2n.

Simplify

3m+4n-6n

= 3m+4n+-6n

Combine like terms

3m+4n+-6n

(3m)+(4n+-6n)

(3m)+(4n-6n)

= 3m -2n

I hope that's help !

Other Questions

Fill In The Table To Remind You Whay happens when you multiply integers

Explain when you know you need to rename a mixed number to subtract

Suppose you are doing a 5,000 piece puzzle. you have already placed 175 pieces. Every minute you place 10 more pieces. Write and equation in slope intercept form to model the number of pieces placed. Is this relationship linear, how do you know?

the half life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. starting with 165 grams of radioactive isotope how much will be left after 4 half lives.