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
pochemuha
3 years ago
10

A first order decomposition reaction has a half-life of 64yr. What percentage of the original amount is left after 135years. (gi

ve answer to 1 decimal place)?
Mathematics
1 answer:
vlabodo [156]3 years ago
4 0

Answer:

23.2%

Step-by-step explanation:

First we need to find how many half lives 135 years is:

135 ÷ 64 = 2.109375

Now we divide 100% by 2 to the power of the number of half lives. This is how you calculate the percentage of the original amount left. If you have the original mass, you can substitute that in instead of 100%:

100 ÷ 2^{2.109375} = 23.1747390635

To 1 decimal place it is 23.2%

You might be interested in
SOMEONE PLEASE HELP ME ON QUESTIONS 17-19 I NEED ASAP
Lana71 [14]

Answer:

17. 10x+24 OR 108   18. 72   19. 8.4

Step-by-step explanation:

(10x+24)+72=180

10x+96=180

10x=84

x=8.4

10x+24

10(8.4)+24

84+24

108

8 0
3 years ago
What is the value of x in this equation
eduard
The the first one the answer should be -4

For the second one the answer should be 3
7 0
3 years ago
Read 2 more answers
What is -12 subtracted from the sum of -19 and 11?
Sauron [17]

Answer:What is -12 subtracted from the sum of -19 and 11?

Step-by-step explanation: 4 IS YOU ANSWER

3 0
3 years ago
Read 2 more answers
Hurry please!!! Quickly! I have to turn this in in 3 minutes---this is the last problem!!!<br> thx
Mama L [17]

1 = 84

3 = 252

7 = 588

10 = 840

5 0
2 years ago
Read 2 more answers
HELP NEEDED ASAP!! Amani computed in a two-way table the relative frequencies of sales of homes listed with two different real e
guajiro [1.7K]
The answer is c.

When you look at the data, in the first column, the frequency of sales of both are similar. Even the second column shows similar data. Association is determined if there is a significant difference between the data in each column/row depending on what you are aiming to answer.

In this case, we look at it per column because you want to compare the frequencies of sales of each company which are aligned by columns. So we know to look at the columns and not the rows.
8 0
3 years ago
Read 2 more answers
Other questions:
  • If 8.45% life of each mobile phone is used in a day by a typical user for which mobile phone is 2.1 hours of battery life used i
    6·1 answer
  • What does the flat portion of the graph represent?
    5·2 answers
  • Which equation best represents the relationship between x and y in the graph? A) y = - 3 4 x - 3 B) y = - 4 3 x - 3 C) y = - 3 4
    7·2 answers
  • PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ HELPPPPPPPPPPP MEEEEEEEEEEE
    9·1 answer
  • What is 11π/6 in degrees?
    7·2 answers
  • Are the two triangles below similar? N 259 50 5 105 50 3 01) ​
    10·1 answer
  • Find the equation of the line that runs through points (1,3) and (2, -1)
    7·1 answer
  • Equação do primeiro grau.<br> -10 + x = -8
    11·2 answers
  • HELP ME WITH THIS MATH QUESTION
    5·1 answer
  • HERE I AM AGAIN, HELPPPPP<br> ILL GIVE BRAINLIEST &lt;3
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!