1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
adelina 88 [10]
4 years ago
5

Maggie was doing research for her Ph.D. in physics when a 12 mg sample of radioactive material decayed to 3 mg in 26 minutes. De

termine the half life of this substance.
Mathematics
1 answer:
netineya [11]4 years ago
3 0

The general way to work this out is to solve the general expression for
the remaining quantity versus half-life, using logarithms.  But that's not
necessary with these numbers.

Look at the numbers:

-- 3 mg is  1/4  of  12 mg.

-- 1/4  is the product of  (1/2) x (1/2).

-- So the  3 mg is what's left of  12 mg after  2  half-lives.
The  26  minutes must be two half-lives.

-- The half-life of that substance is  26/2 = <em>13 minutes</em>.

Go Maggie !

You might be interested in
How is this problem done <br> 5/2+2/3+n=1/6
balandron [24]
The main thing you have to do is get the common denominator...hope the picture helps

3 0
3 years ago
A canoe rental service charges a $30 transportation fee and $15 an hour to
Blizzard [7]

Answer:

5 hours

Step-by-step explanation:

Your equation is 105 = 15x + 30 subtract 30 from both sides, then divide by 15 to get x = 5 hours.

Brainliest would be apprappreciated. :-)

8 0
3 years ago
Bob flipped a coin and got “heads” 9 times in a row! What is the probability that’s the next flip will be a “head”?
UkoKoshka [18]

Answer:

50/50 chance

Step-by-step explanation:

A coin only has 2 sides so when you flip it you will always have a 50/50 chance of landing on heads or tails

8 0
3 years ago
Determine whether each relation is a function <br> X=-2 <br> Y=2
mash [69]
X = -2 would not be a function because if you graph it, it is a vertical line. 
Y = 2 is a function because when graphed, it is shown as a horizontal line and passes the vertical line test.
7 0
4 years ago
In March, Derrick had $25.50 in credit card debt.
Snezhnost [94]

Answer:

-20.50?

Step-by-step explanation:

I think you said he added 5 dollars in his account which would get some of his debt removed. But he would still have a remaining -20.50 dollars to get rid of.

8 0
3 years ago
Other questions:
  • a line t has the equation 5x-y-4=0. write down the equation of a line which passes through (1,-3), a) which is parallel to T, b)
    11·1 answer
  • New York City is a popular feild trip destination. This year the senior
    12·1 answer
  • Hurry please
    11·1 answer
  • There is a room that has 5 walls.
    9·1 answer
  • Can the y-values of a data set have both a common difference and a common ratio? Explain your reasoning.
    8·1 answer
  • There are 3 red, 1 blue and 2 yellow marbles in a bag. Once a marble is selected it is not replaced. Find
    12·1 answer
  • If m1 = 27° and m2 = 90°, what is m3?
    7·1 answer
  • What does v. P=mv mean <br> can someone help
    5·2 answers
  • A bicycle has a listed price of 538.98 before tax. If the sales tax rate is 6.75%, find the total cost of the bicycle with sales
    9·1 answer
  • Vocabulary Choose the example of an inverse relationship
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!