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
Elena L [17]
3 years ago
10

Find the substance's half-life, in days. Round your answer to the nearest tenth.

Mathematics
1 answer:
shutvik [7]3 years ago
4 0

Answer:

t = 5.6 day

t =5 days 14 hours 24 minutes

Step-by-step explanation:

Half life is the time it will take for the original value or quantity I'd a particular substance to decrease by half of it's original self.

N = N•e(-kt)

N• = 25

K = 0.1229

Then

N = 25/2 = 12.5

The reason because at the half life , it's original value will decrease to half.

Let's solve for the half life t

N = N•e(-kt)

12.5 = 25e(-0.1229t)

12.5/25 = e(-0.1229t)

0.5 = e(-0.1229t)

In 0.5 =-0.1229t

-0.69314 = -0.1229t

-0.69314/-0.1229 = t

5.6399 = t

To the nearest tenth

5.6 days = t

You might be interested in
At the bank, Derek made 7 withdrawals, each in the same amount. His brother, John, made 5 withdrawls, each in the same amount. E
spayn [35]

At the bank, Derek made 7 withdrawals, each in the same amount. His brother, John, made 5 withdrawls, each in the same amount.

Let x be  the amount of one of Derek's withdrawals

Each of John's withdrawals was $5 more than each withdrawal that Derek made.

x + 5 is t the amount of one of John's withdrawals

Derek made 7 withdrawals

So amount withdraw 7 times = 7x

John made 5 withdrawals

So amount withdraw 5 times = 5(x+5)

Both Derek and John withdrew the same amount of money in the end

(A) 7x = 5(x+5)

(B) Solve for x

7x = 5x + 25

Subtract 5x from both sides

2x = 25

Divide by 2

x = 12.5

(C) check your solution

we plug in 12.5 for x in 7x= 5x + 25

7(12.5) = 5(12.5) + 25

87.5 = 62.5+ 25

87.5 = 87.5

(D) Each brother withdrawal 87.5 dollars



6 0
2 years ago
Mai had 5 candy bars. She ate half of one candy bar and decided to distribute the remaining bars between her two sisters and her
brilliants [131]
1 and 2/3 is the answer
7 0
3 years ago
Read 2 more answers
Plzzzzz help , really easy im just du mb
ra1l [238]

Answer:

Step-by-step explanation:

They are about 3 meters away from each other

and the correct area is 15.5-12 and the correct answer is 3.5 meters apart

3 0
3 years ago
Read 2 more answers
Explain the distance formula. Then use it to calculate the
Alex777 [14]

Answer:

dAB=10\ units

Step-by-step explanation:

we know that

The <u>distance formula</u> is derived by creating a triangle and using the Pythagorean theorem to find the length of the hypotenuse. The hypotenuse of the triangle is the distance between the two points

The formula to calculate the distance between two points is equal to

d=\sqrt{(y2-y1)^{2}+(x2-x1)^{2}}

we have

A(1, 1) and B(7, −7)

Let

(x1,y1)=A(1, 1)

(x2,y2)=B(7, −7)

substitute the given values in the formula

dAB=\sqrt{(-7-1)^{2}+(7-1)^{2}}

dAB=\sqrt{(-8)^{2}+(6)^{2}}

dAB=\sqrt{64+36}

dAB=\sqrt{100}

dAB=10\ units

6 0
2 years ago
Read 2 more answers
1 quart=4 cups (whats the answer?)
Sever21 [200]

Answer:

1quart 4cups =8quatcups

Step-by-step explanation:

thanks:)

7 0
2 years ago
Read 2 more answers
Other questions:
  • Based on the graph, how many students are represented? A) 100 students B) less than 150 C) less than 200 D) less than 300
    14·1 answer
  • Thank you for the help guys! <br><br> Find m ABC
    8·1 answer
  • 4. Using the given information, which lines, if any, can you conclude are parallel? Justify your conclusion with a theorem or po
    9·1 answer
  • (889x27)+50 is_____than 889x27
    9·1 answer
  • Y = 2x – 6 y = –4x + 3<br> will give brainliest
    13·1 answer
  • I’m having some trouble with this can someone pls help?
    5·1 answer
  • Y=-5x-2<br> Y=6x+9<br> What is my answer
    9·1 answer
  • A 35.0 g arrow is shot from a bow and arrow with a horizontal speed of 4.50 m/s. The total mechanical energy of the dart is 0.39
    6·1 answer
  • Write the inequality for the following: Five less than a<br> number is no less than 14.
    14·1 answer
  • I need help doing this
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!