All categories

1 year ago

Will mark brainliest, need help ASAP!

Mathematics

1 answer:

nikitadnepr [17]1 year 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

Solve for c: <br> 12 - 9 + c = 12

enyata [817]

Step-by-step explanation:

12 - 9 + c = 12

-9 + c = 12 - 12

- 9 + c = 0

Therefore c = 9

Hope this helps.!

6 0

3 years ago

Read 2 more answers

HELP ME PLEASE ITS DUE TODAY!!!!

Stells [14]

Step-by-step explanation:

$- 5 - ( - 4) = - 5 + 4 = - 1 \\ - 4 - ( - 5) = - 4 + 5 = 1 \\ - 4 - (5) = - 4 - 5 = - 9 \\ 4 - ( - 5) = 4 + 5 = 9$

Therefore ranking them from least to most:

$- 4 - (5) \\ - 5 - ( - 4) \\ - 4 - ( - 5) \\ 4 - ( - 5)$

5 0

2 years ago

Points N and R both lie on circle O. Line segment RQ is tangent to the circle at point R.

4vir4ik [10]

Answer:

15.0

Step-by-step explanation:

Let's start by looking at triangle ORQ. Since RQ is tangent to the circle, we know that angle ∠ORQ is 90°. Then, since OR is equivalent to the radius of 5, RQ is 5√3, and side OQ is clearly larger than RQ, we can identify this as a 90-60-30 degree triangle. This makes side OQ have a length of 10, and angle ∠QOR, opposite of the second largest side, has the second largest angle of 60°, leaving ∠OQR with an angle of 30°.

The formula for the chord length is 2r*sin(c/2), with c being the angle between the two points on the circle (in this case, ∠QOR=∠NOR).. Our radius is 5, so the length of chord NR is 2*5*sin(60/2)=5, making our answer 5(ON)+5(OR)+5(RN)

4 0

3 years ago

Read 2 more answers

Mr. Babe used to work at a local furniture store.

8090 [49]

A. Mr. Babe made a commission of $14.85

B. He makes $15.75 per hour after the raise.

Step-by-step explanation:

A. While he worked there, Mr. Babe earned 3% on how much he sells. If he sold $495 couch, how much commission did he make?

Worth of sold couch = $495

Commission = 3%

Amount of commission = 3% of total worth sold

Amount of commission = $\frac{3}{100}*495$

Amount of commission = $\frac{1485}{100}=\$14.85$

Mr. Babe made a commission of $14.85

B. On top of his commission, Mr. Babe made $15 per hour. He eventually got a raise with an increase of 5% per hour. After the raise, how much did he make per hour?

Amount earned per hour = $15

Increase = 5%

As the increment is on per hour amount, therefore,

Amount of increase = 5% of per hour amount

Amount of increase = $\frac{5}{100}*15=\frac{75}{100} = \$0.75$

New amount per hour = Per hour amount + amount of increase

New amount per hour = 15+0.75 = $15.75

He makes $15.75 per hour after the raise.

Keywords: percent, addition

Learn more about addition at:

#LearnwithBrainly

7 0

3 years ago

In a class of strength 60, 75% like to become teachers. how manu dont like to be teachers?

timurjin [86]

No. of people don't like to be teacher

= 100% - 75% = 25%

<h3> $\frac{25}{100} \times 60 \\ = 15$ </h3>

So, 15 number of students doesn't like to be teacher

4 0

3 years ago