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
Jerome added two numbers.The sum was 83.One of the numbers was 45.What was the other number?
Sindrei [870]
To know the second number we should 83 - 45 and we get 38. Now we need to check the result.
45 +38, we'll get 83.
So the answer is correct.

83 - 45 = 38

<em><u>The answer is 38.</u></em>
6 0
3 years ago
PLEASE HELP I really need help with it:/
Luda [366]

Answer:

  • q = 14

Step-by-step explanation:

<u>We know that:</u>

  • 39 + (4q - 5) = 90°

<u>Solution:</u>

  • 34 + 4q = 90°
  • => 4q = 90 - 34
  • => 4q = 56
  • => q = 56/4
  • => q = 14

Hence, the value of q is 14.

7 0
2 years ago
Read 2 more answers
Find the volume of the cone.
Ne4ueva [31]

Answer:

3142.86 cubic cm

Step-by-step explanation:

volume of cone is given by formula

volume of cone = 1/3(area of base*height)

Given radius of base = 10cm

we know area of circle is given by \pi  r^2 where r is radius of circle

thus area of base of cone is calculated below

\pi 10^2\\=> 22/7 *100\\=> 314.2857

area of base of cone is 314.2857 square cm

height = 30 cm

Thus volume of cone  = 1/3* (area of base*height)

                                   = 1/3(314.2857*30)

                                   = 1/3 *9428.571 = 3142.857.

Thus, volume of cone is 3142.857 cubic cm.

volume of cone  to the nearest hundredth is 3142.86 cubic cm

6 0
3 years ago
Blank - 5.27 = 2.99<br> literally forgot how decimals work
bulgar [2K]

Answer:

8.26

Step-by-step explanation:

you can solve this by putting x for blank

x-5.27=2.99

solve for x

x-5.27+5.27=2.99+5.27

x=8.26

3 0
2 years ago
Read 2 more answers
Which of the following expressions are equivalent to (x + y) - z
andrey2020 [161]

C: None of the above

7 0
3 years ago
Read 2 more answers
Other questions:
  • What is the solution to the equation 9^(x - 2) = 27 ? x = 2.5/ x = 0.5/ x = -0.5 /x = 3.5
    8·2 answers
  • Which of the following expressions is written in scientific notation?
    9·2 answers
  • How many points need to be removed from this graph so
    7·1 answer
  • How many planes appear in the figure​
    9·1 answer
  • A star is measured to be 24 kiloparsecs from Earth. A kiloparsec is 1000 parsecs. A parsec is 3.26 light-years. How many light-y
    9·1 answer
  • URGENT!!! Which one of these relationships is different than the other three?
    15·1 answer
  • Determine the domain for the table below.
    6·1 answer
  • John order sneakers online. He ordered 2 pairs of Nikes at $50 each and 4 pairs of Yeezy's at $100 each. He also paid a shipping
    11·1 answer
  • Which of the following is equivalent to 3.39 x 10^8 ml?
    15·1 answer
  • What is the value of the expression 2 to the third power plus 3 over 5 times 5 over 9 minus 4 plus 3.?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!