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
zepelin [54]
2 years ago
10

Element X is a radioactive isotope such that every 25 years, its mass decreases by half. Given that the initial mass of a sample

of Element X is 50 grams, how much of the element would remain after 23 years, to the nearest whole number?
Mathematics
1 answer:
Julli [10]2 years ago
7 0
50*(.5)^(23/25)=26.43
You might be interested in
The first ten terms of a sequence whose first term is -10 and whose common difference is -2.
otez555 [7]

Answer:

-10

-12

-14

-16

-18

-20

-22

-24

-26

-28

-30

5 0
3 years ago
Weinstein, McDermott, and Roediger report that students who were givne questions to be answered while studying new material had
emmainna [20.7K]
<h2>Answer with explanation:</h2>

Let \mu be the population mean.

By considering the given information , we have

Null hypothesis : H_0: \mu=73.4

Alternative hypothesis :  H_a: \mu>73.4

Since alternative hypothesis is right-tailed , so the test is a right-tailed test.

Given : Sample size : n=16 , which is a small sample , so we use t-test.

Sample mean: \overline{x}=78.3  ;

Standard deviation: s=8.4

Test statistic for population mean:

t=\dfrac{\overline{x}-\mu}{\dfrac{s}{\sqrt{n}}}

i.e. t=\dfrac{78.3-73.4}{\dfrac{8.4}{\sqrt{16}}}\approx2.333

Using the standard normal distribution table of t , we have

Critical value for \alpha=0.01 : t_{(n-1,\alpha)}=t_{(15,0.01)}=2.602

Since , the absolute value of t (2.333) is smaller than the critical value of t (2.602) , it means we do not have sufficient evidence to reject the null hypothesis.

Hence, we conclude that we do not have enough evidence to support the claim that answering questions while studying produce significantly higher exam scores.

3 0
2 years ago
How to solve 18-4t/.5=20
Damm [24]
Divide .5 4 then do the rest
7 0
3 years ago
Danielle spent 35$ on a magazine and some notepads. If the magazine cost 3$ and each notepad cost 4$ then how many notepads did
kifflom [539]
She bought 8 notepads
3 0
3 years ago
Read 2 more answers
Simplify <br><img src="https://tex.z-dn.net/?f=4%20%2B%20%20%5Cfrac%7B3%7D%7B7%7Dx%20-%202%20-%20%20%5Cfrac%7B2%7D%7B7%7Dx%20%20
Sloan [31]

4 + \frac{3}{7}x - 2 - \frac{2}{7}x\\\\\text{combine like terms}\\\\\left(\dfrac{3}{7}x-\dfrac{2}{7}x\right)+(4-2)=\dfrac{3-2}{7}x+2=\boxed{\dfrac{1}{7}x+2}

6 0
3 years ago
Read 2 more answers
Other questions:
  • A scatter plot with a very strong linear association will have a correlation that is close to
    7·1 answer
  • Michael had 4/5 of a spool of yarn. He used 3/5 of it for his project. What fraction of the spool was used for his project?
    7·1 answer
  • The perimeter of a rectangle is 42 cm. The longer side has length of 7 cm more than the shorter side. Find the length of longer
    9·2 answers
  • What is the relationship between fractions and decimals?
    6·1 answer
  • Suppose that l lines are drawn through a circle and these lines form p points of intersection (involving exactly two lines at ea
    13·1 answer
  • Y=4x/2<br> Find y when x<br> is -2, -1, 0, 1, 2
    11·2 answers
  • What is the solution to the equation 3 + 4/4y = 4?
    9·1 answer
  • The y-intercept for the line defined by {y + 3 = 3(x + 3) }is (0, y). What is<br> the value of y?
    11·1 answer
  • What is the measure of SQ?<br><br> 1. 95<br> 2. 190<br> 3. 265<br> 4. 360
    11·1 answer
  • Factor completely: x^4 - 16
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!