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
Martin has 2 5/8 pounds of ground beef. He wants to divide the beef into equal sized portions to put into his freezer. The porti
Licemer1 [7]

Answer:

a) 7 equal sized pieces of 3/8 pounds

               7* 3/8 =  21/8

b) 3 equal sized pieces of 7/8 pounds

               3* 7/8 =  21/8

Step-by-step explanation:

Martin has 2 5/8 pounds of ground beef.

2 5/8 = 21/8 pounds = 2.625 pounds

Because 21 is divisible by 3 and 7, we can arrange the ground beef in two configurations

a) 7 equal sized pieces of 3/8 pounds

               7* 3/8 =  21/8

b) 3 equal sized pieces of 7/8 pounds

               3* 7/8 =  21/8

6 0
3 years ago
The foot, the pound, and the gallon are all example of ______ units. This system of measurement was first devised in England
viva [34]
Are all examples of imperial units, possibly
7 0
3 years ago
Please work this out
cestrela7 [59]

Answer:

? = 85°

Step-by-step explanation:

the sum of the interior angles of a polygon is

sum = 180° (n - 2) ← n is the number of sides

here n = 5 , then

sum = 180° × 3 = 540°

sum of the angles around a point = 360° , so

interior angle on right = 360° - 250° = 110°

sum the interior angles and equate to 540°

110° + 115° + 120° + 110° + ? = 540° , that is

455° + ? = 540° ( subtract 455° from both sides )

? = 85°

7 0
2 years ago
The numbers of pages in the books in a library follow a normal distribution. If the mean num
bogdanovich [222]

Answer:

For the answer to the question above, the numbers of pages in the books in a library follow a normal distribution. If the mean number of pages is 180 and the standard deviation is 30 pages, you can conclude that about 16% of the books have fewer than 150 pages.

7 0
2 years ago
Mathematical x4 - x2 ≥ 2x
kondaur [170]
X4-x2≥ 2x~~~2x≥ 2x True Because " _ " is the same thing with "=" ; and because 2x=2x then 2x≥ 2x ~~~~~~Have a nice day!!! ★★
4 0
3 years ago
Other questions:
  • -2b-6+3b-2 simplified
    9·2 answers
  • |-2y+5|=2|4y-1| The solutions are y= and y=
    11·1 answer
  • A teacher bought 12 sheets of stickers to use on the homework of her students. Each sheet had 48 stickers. At the end of the yea
    5·1 answer
  • a roller coaster train with 6 passenger cars and the front decoration has a mass of 3500 kg. when the train has the front decora
    13·1 answer
  • How do you write 740% as a fraction or mixed number in simplest form?
    7·2 answers
  • The sum of x and 4 is greater than the difference of 2x and 3. Find x
    10·1 answer
  • What is the calculation of double the product of 4 times 7
    10·2 answers
  • B) Three times a number minus 4 is four times the number plus 1. What is the number?
    9·1 answer
  • A credit card company charges 17% interest on any charges not paid at the end of the month. In February, $14.45 was paid in inte
    8·2 answers
  • Please help me im dying help
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!