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
azamat
2 years ago
6

The half-life of a radioactive element is five years. A scientist has 18 grams of the element. The equation

Mathematics
1 answer:
lianna [129]2 years ago
7 0

Answer:

The equation that describes the amount of mass left after a time t of a radioactive isotope is the following:

where

is the mass of the sample at t = 0

is the half-life of the sample

For the element X in this problem,

We want to find the time t at which

So we need to re-arrange the equation making t the subject:

Step-by-step explanation:

You might be interested in
What is 7/21 in its simplest form
olasank [31]
The answer is 1/3 because 7 can go into 21 so then 7 goes into 7 one time and then it goes into 21 three times so then you would get 1/3

5 0
3 years ago
Read 2 more answers
Please help!!
yarga [219]

Because this is a fourth degree that will be tricky to factor as it is, we will do a u substitution. Let x^2=u. We can now rewrite that polynomial in terms of u: u^2-7u-8=0. Filling into the quadratic formula we have u=\frac{7+/-\sqrt{49-4(1)(-8)}}{2}. Simplifying down u=\frac{7+/-\sqrt{81}}{2} and u=\frac{7+9}{2} or u=\frac{7-9}{2}. That means that u = 8 or u = -1. But don't forget that we let u=x^2, so we have to put x-squared back in for u. That gives us x^2=8 which simplifies down to +/-2\sqrt{2}. That also gives us x^2=-1. When we take the square root of -1, we have to use the fact that -1 = i^2, so we sub that in to get x=+/-i. All in all, your solutions are as follows: 2\sqrt{2},-2\sqrt{2},i,-i which is choice b.

7 0
3 years ago
Can someone help me with this. Will Mark brainliest . Need answer and work/explanation. Thank you.
Rom4ik [11]

Answer:

Hope it helps...

Step-by-step explanation:

5 0
2 years ago
Xtrapolated Data Predictions
VladimirAG [237]

Answer:

Eventually the coat sales will be negative, which is not possible.

Eventually the temperature will increase or decrease to impossible values.

Some predictions may not be accurate.

Step-by-step explanation:

Does dis help?1!!>!>!

Make sure to rate and like!

7 0
3 years ago
Read 2 more answers
laura has a toy robot collection 4/7 of her robots makes noise how many of lauras robots make noise? and can u show ur work pls
ololo11 [35]

Answer:

57 percent

Step-by-step explanation:

4 divided by 7= .57

  •                57 reminder 1
  •             ________
  •          7l 40
  •               35
  •                  50
  •            so the total is 57      
4 0
2 years ago
Other questions:
  • Pens cost $0.20 each. Pencils cost $0.15 each. Write an algebraic expression that represents the total cost of buying p pens and
    8·1 answer
  • The graph of an arithmetic sequence is shown.
    7·2 answers
  • Jacob is driving home he drove 10 miles and his house is 156 miles away from him how longer does Jacob need to travel
    6·2 answers
  • ASAP HELP PLEASE FIND THE VALUE OF M AND N
    11·1 answer
  • Como puedo aser este numero en forma expandida 373,698​
    6·1 answer
  • Solve for x.<br><br><br><br> 14+12+x=−34<br><br><br><br> Enter your answer in the box.<br><br> x=
    6·2 answers
  • Photography can trace its roots back to the mid-18th century?
    14·2 answers
  • Point N lies on the line segment MP . The distance between points M and P is 24 cm, and the distance between points N and M is t
    10·1 answer
  • A washer and a dryer cost $596 combined. The washer costs $54 less than the dryer. What is the cost of the dryer?
    5·1 answer
  • 9. What are the dimensions of the rectangle?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!