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
Ierofanga [76]
2 years ago
13

Will mark brainliest, need help ASAP!

Mathematics
1 answer:
nikitadnepr [17]2 years ago
5 0

The percentage of the original sample that is left after 115 days is; 23.4733%

<h3>How to calculate the decay percentage?</h3>

Formula for radioactive decay is;

A = A₀ * (1/2)^(t/t_¹/₂)

where;

A = quantity of the substance remaining

A₀ = initial quantity of the substance

t = time elapsed

t_¹/₂ = half life of the substance

Thus;

A/A₀ =  (1/2)^(115/55)

A/A₀ =  0.234733 or 23.4733%

Read more about decay constant at; brainly.com/question/11117468

#SPJ1

You might be interested in
How do you know that a =6 is a solution to a+5=11?
Sati [7]

a + 5 = 11

You need to isolate the variable by subtracting from both sides

a + 5 - 5 = 11 - 5a = 6

The Addition/Subtraction Property of Equality states that if you add or subtract the same number to both sides of an equation the two sides still remain equal

:))

3 0
4 years ago
Please help me! I really need help on this ASAP
andrey2020 [161]

Answer:

the vertex of the parabola is at the point; (5, -1)

which agrees with answer "B" in the list of options

Step-by-step explanation:

Notice that this is the equation of a parabola with branches that open horizontally (not vertically), since the variable the goes squared is the y-variable instead of "x".

By analyzing it we can then write it by isolating the term in "x" on one side of the equation, and use at the same time the fact that it is being written in "vertex" form:

-8\,(x-5)=(y+1)^2\\(x-5)=-\frac{1}{8} (y+1)^2

Therefore, the "y-value" of the vertex must be that which renders zero in the expression squared, that is y = -1. On the other hand, the x-value of the vertex is that which renders zero for the variable "x":  x=5.

Then, the vertex of the parabola is at the point; (5, -1)

8 0
3 years ago
Please transform f(x)=2x^2-8x-24 into factored form and vertex form. please help me!
joja [24]
The answer is: 2(x−6)(x+2)<span>
</span>
8 0
4 years ago
List all possible rational zeros given by the rational zeros theorem (but don't check to see which actually are zeros). (enter y
aksik [14]
Hey i think 45.............
4 0
3 years ago
A room has an area of 60 square meters and a perimeter of 32 meters what are the length and width of the room
Viefleur [7K]
10 by 6
10*6=60
10+10+6+6=32
8 0
3 years ago
Other questions:
  • Justin and Pedro each launched a toy rocket into the air. The height of Justin’s rocket is modeled by the equation h = –16t^2 +
    9·1 answer
  • What is -4(x-3) equal
    11·1 answer
  • the Diameters of Circles A, C and E are 32cm, 24 cm and 14 cm respectively. Which of the following statements are true? Select a
    10·1 answer
  • What is the area of the figure below?<br><br> 45 in^2<br> 90 in^2<br> 135 in^2<br> 180 in ^2
    10·2 answers
  • Re-write the quadratic function below in Standard Form<br> y = -7(x + 9) (x - 1)
    7·1 answer
  • Akiko walks 2/3 mile in 1/4 hour. What is Akiko's unit rate in miles per hour? Need answer really fast please
    10·1 answer
  • Word phrase of 3.5v?
    10·1 answer
  • Uhhh please help lol
    11·1 answer
  • PLS HELP WILL MARK BRAINLIEST, NO FAKE ANSWERS OR WILL BE REPORTED.
    14·2 answers
  • Help<br> what time does this clock says?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!