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
EleoNora [17]
2 years ago
7

A sample originally contains 21 grams of a radioactive isotope. After 45 days, 17.3 grams of the isotope remain in the sample.

Mathematics
2 answers:
Darya [45]2 years ago
4 0

Answer:

The answer to your question is:  128 days

Step-by-step explanation:

Data

original mass = 21 g

after 45 days = 17.3 g

Process

mass transform = 21 - 17.3 = 3.7 g

               

                                21 g ----------------------- 100 %

                                3.7 g ---------------------   x

                                x = (3.7 x 100) / 21

                                x = 17.61 %

                               17.61 % -------------------  45 days

                               50%    --------------------  x

                              x = (50 x 45) / 17.61

                              x = 127.8 ≈ = 128 days

AlekseyPX2 years ago
3 0

Answer:

It is actually 161

You might be interested in
What is the surface area of this figure?
jeyben [28]
548 is the correct answer.
feel free to ask any questions !!
hope this helps :)
5 0
3 years ago
Read 2 more answers
Find the next two term in this sequence​
MariettaO [177]

Answer: 0.5 and 0.25

Step-by-step explanation: You have to divide the number by 2 to get to the next term.

7 0
3 years ago
Read 2 more answers
The coordinates of the midpoint of gh are m(-13/2,-6) and the coordinates of one endpoint are g(-4,1). what is the other endpoin
Alex777 [14]

Applying the midpoint formula, the coordinates of the other endpoint are: (-9, -13).

<h3>How to Apply the Midpoint Formula?</h3>

The midpoint formula, which can be used in determining the coordinates of the midpoint between two endpoints is usually expressed as: M[(x1 + x2)/2, (y1 + y2)/2].

Given the following coordinates:

Midpoint of GH --> m(-13/2,-6) = (x, y)

One endpoint ---> G(-4, 1) = (x1, y1)

The other endpoint ---> (x2, y2)

Plug in the values into the formula used in calculating the midpoint:

m(-13/2,-6) = [(-4 + x2)/2, (1 + y2)/2]

Solve for x2

-13/2 = (-4 + x2)/2

-13/2 × 2 = -4 + x2

-13 = -4 + x2

-13 + 4 = x2

-9 = x2

x2 = -9

Solve for y2

-6 = (1 + y2)/2

2(-6) = 1 + y2

-12 = 1 + y2

-12 - 1 = y2

-13 = y2

y2 = -13

Thus, using the midpoint formula, the coordinates of the other endpoint are: (-9, -13).

Learn more about the midpoint formula on:

brainly.com/question/13115533

#SPJ1

4 0
1 year ago
Which statement is modeled by the expression?
Afina-wow [57]
A librarian has 150 books to be placed on shelves with an equal number of books on each shelf. If k is the number of shelves to be used, then 150/k is the number of books on each shelf.

Example : lets say there are 10 shelves.....so k = 10
150/10 = 15 books on each shelf.
4 0
2 years ago
Read 2 more answers
Pls hurry!!! I need to finish! Look at the photo, its problem 38 that I’m on.
lara [203]
I'm not sure sry maybe you should of studied
3 0
3 years ago
Read 2 more answers
Other questions:
  • Show AND justify each step of the solution. You will not receive credit unless you justify the step.
    10·1 answer
  • Connie Hamm demonstrates microwave ovens. She earn $5.00 per demonstration for the first 10 demonstrations and $6.00 for each de
    7·1 answer
  • a welder earns $20 an hour for the first 40 hours she works in a week and $30 for every hour over 40 hours. Determine a piece wi
    10·1 answer
  • A handyman knows from experience that his 29-foot ladder rests in its most stable position when the distance of its base from a
    5·1 answer
  • Please help with these if you can
    8·2 answers
  • Find the missing sides.
    11·1 answer
  • A random sample is to be selected from a population that has a proportion of successes p=.60. When n=400, what is the probabilit
    13·1 answer
  • Find all real zeros of the function f(x) = 5x (x-16)² (x-2)²
    10·1 answer
  • Round these numbers to the numbers to the nearerst 1000<br><br>1781<br>​
    15·2 answers
  • What is the expanded form of 14.702
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!