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
Bess [88]
3 years ago
8

The​ half-life of radium is 1690 years. If 20 grams are present​ now, how much will be present in 250 ​years?

Mathematics
1 answer:
Aneli [31]3 years ago
3 0

Answer:

  18.05 g

Step-by-step explanation:

The multiplier of the initial quantity is ...

  (1/2)^(t/1690)

so, for t=250, this becomes ...

  (1/2)^(250/1690) ≈ 0.902545

Then the quantity remaining of the initial 20 g is ...

  (20 g)(0.902545) ≈ 18.05 g

You might be interested in
a drink recipe calls for lemon juice and apple juice. the equation below represents the proportional relationship between the cu
GREYUIT [131]

Answer: ima newbie

Step-by-step explanation:

Always include the steps and/or background required to get to the final answer. Let’s help other people understand and solve future problems on their own. Show all the calculation if it is a numerical question.

8 0
3 years ago
One mixture contains 6 fluid Ounces of water and 10 fluid Ounces of vinegar. A second mixture
Nadya [2.5K]

Answer:

The mixtures are not proportional.

3 fluid ounces of vinegar has to be added in the second mixture to make it proportional to the first mixture.

its =3

Step-by-step explanation:

The one mixture contains 6 fluid ounces and 10 fluid ounces of water and vinegar respectively.

Therefore, the ratio of water to vinegar in the first mixture is 6 : 10 = 3 : 5

Now, a second mixture contains 9 fluid ounces of water and 12 fluid ounces of vinegar.

Hence, the ratio of water to vinegar in the second mixture is 9 : 12 = 3 : 4

Therefore, the mixtures are not proportional.

Therefore, we have to add x fluid ounces of vinegar to the second mixture to make it in the ratio of 3 : 5.

So,

⇒ 12 + x = 15

⇒ x = 3 fluid ounces.

Therefore, 3 fluid ounces of vinegar has to be added in the second mixture to make it proportional to the first mixture. (Answer

5 0
2 years ago
Find the greatest common factor of numbers using prime factorization 32 and 90
Gemiola [76]

the greatest common factor of 32 and 90 is 2

8 0
3 years ago
What is the rate of heat transfer required to melt 1-ton of ice at 32 F in 24 hours?
LiRa [457]

Answer:

3865.74 J/s

Step-by-step explanation:

mass of ice, m = 1 ton = 1000 kg

time , t = 24 hours

latent heat of fusion of ice, L  = 334000 J/kg

Heat required to melt, H = m x L

where, m is the mass of ice and L be the latent heat of fusion

So, H = 1000 x 334000 = 334 xx 10^6 J

Rate of heat transfer = heat / time = \frac{334\times 10^{6}}{86400}

Rate of heat transfer = 3865.74 J/s

thus, the rate of heat transfer is 3865.74 J/s.

8 0
3 years ago
A water tank is 3/4 full.
guapka [62]

x/.75=x-56/0.4

0.4x=.75x-42

-0.35x=-42

x=120

I set up a proportion in which x=the tank when it is 3/4 full. When the tank is 3/4 full, solving the proportion tells us the x=120 litres. 120/3=40, and 120+40 is 160, showing that a tank completely full would indeed hold 160 litres.

Hope this helps!

3 0
3 years ago
Other questions:
  • If used compensation to find product of 37x4 first she found 40x4=160 then adjusted that product by adding 3 groups of 4 to get
    11·1 answer
  • Usha and Parker have a combined monthly net income of $4,500. They both chip in to pay their $675 rent each month. They also hav
    9·1 answer
  • Find the surface area. SHOW WORK
    10·1 answer
  • What is the answer to 978 -(6x8) + 99 =
    11·2 answers
  • What is the numerical solution to the equation five less than three times a number equals four more than eight times the numbers
    12·1 answer
  • Which situation represents linear proportional relationships
    9·1 answer
  • Jared is 10 years old, and Peter is 15 years old. Together, they run 150 yards. How far does each brother run. if a brother is t
    8·1 answer
  • Which statement is true regarding the functions on the
    13·1 answer
  • Which is the graph of the line y - 2 = 3(x - 1)?
    8·1 answer
  • A hot-air balloon is 1200 feet off the ground and its altitude is slowly changing at a constant rate of −712 feet per second.
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!