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
Ipatiy [6.2K]
3 years ago
9

A radioactive substance decays according to the formula A=A0e^kt

Mathematics
1 answer:
Sholpan [36]3 years ago
4 0
Without needing fancy formulas, we can conclude that after 10 years, half of the substance will be left.  So, we can make our own formula:
amount remaining = 1 / 2^(years/10)
So, after 5 years
amount remaining = 1 / 2^(5/10)
amount remaining = 1 / 2^(.5)
amount remaining = 1 / <span> <span> <span> 1.414213562 </span>
</span></span><span>amount remaining = 0.70711 * 20 grams
</span><span><span><span><span>amount remaining = </span>14.1421356237 grams

</span></span></span>


You might be interested in
A meteorologist at a television station that a town received 0.95 in of rain. What fraction is equivalent to this amount of rain
Doss [256]
19/20, because when you divide 19 into 20 you get... 0.95
8 0
3 years ago
Read 2 more answers
What did the harlem renaissance celebrate accomplished and lead to in the early 1900’s
natima [27]

Answer:

The migration of the African-Americans to Harlem in the USA empowered the African-Americans in the society in the early 1900s. This was one of the greatest accomplishments of the African-Americans in history.

Explanation:

The "Harlem Renaissance" was originally called the "New Negro Movement." During the "Reconstruction Era," many of the African Americans felt a newfound empowerment in the society. They started leaving the South, where most of them were enslaved and maltreated. Many of them moved to other places such as "Harlem" in New York City. It became an ideal destination for many "Negros" and their number increased over time.<u> This then became an African-American neighborhood</u>.

African-Americans started producing plays with actors of their descent. Several Negro poets emerged describing the life of the African-Americans. Negros became more literate and able when it comes to expressing themselves in the society. They even had their own newspaper known as<em> "The New Negro Movement."</em>

8 0
3 years ago
X-9= 1/4x + (1/4x + 12) + (1/4x - 3) what’s that answer?
konstantin123 [22]

Answer:

x = 72

Step-by-step explanation:

Make the problem simpler by eliminating the fractional coefficients:

x-9= 1/4x + (1/4x + 12) + (1/4x - 3), when multiplied by 4, becomes:

4x - 36 = x + x + 48 + x - 12

Summing up all the x terms, we get:

4x - 2x - x = 48 - 12 + 36

Then x = 72

7 0
3 years ago
A card is drawn from a standard 52-card deck. What is the probability that the card is a red 8, given that the card is an 8?
crimeas [40]
<span>probability that the card is a red 8
=
2 out of 52 or 1 out of 26

hope it helps</span>
8 0
3 years ago
Read 2 more answers
Help me please for brainlist
allochka39001 [22]

Answer:

b. 82m³

Step-by-step explanation:

V = \frac{1}{3}(\frac{1}{2} bh_1)h_2\\b = 8.2m\\h_1 =  4m\\h_2 = 15m\\\\V = \frac{1}{3}(\frac{1}{2}(8.2)(4))(15)\\V = 82m^{3}\\

3 0
2 years ago
Read 2 more answers
Other questions:
  • Part a give the number of total electron groups, the number of bonding groups, and the number of lone pairs for the geometry dep
    14·1 answer
  • You randomly draw a marble from a bag, record its color, and then replace it. You draw a blue marble 3 out of 50 times. What is
    7·1 answer
  • Can someone please help me!!
    6·1 answer
  • What is the name of a solid that has two parallel polygon bases and all other faces that are rectangles?
    11·2 answers
  • What are the domain and range of the function {(3, 1), (5, –1), (9, –1), (2, 7), (–4, 1)}?
    9·1 answer
  • What number goes into 220 and 1000?
    9·1 answer
  • a bowl contains 6 blue and four red marbles. Three random picks are to be made from the bowl in the following fashion: for each
    6·1 answer
  • How to find the diameter of a circle when given the circumference?
    6·1 answer
  • Find the slope of the line that passes through (54, 8) and (87, -40).
    7·1 answer
  • Which Of The Following is Graphed Below
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!