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
Papessa [141]
2 years ago
12

the half -life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mas

s. starting with 155 gramsbof a radioactive isotope, how much will be left after 3 half-lives?​
Mathematics
1 answer:
SVETLANKA909090 [29]2 years ago
7 0

Answer:

after 3 half lives the amount should be reduced to 19.375g

Step-by-step explanation:

after the first half life , amount left =

155÷2

= 77.5g

2nd half life

77.5÷2

=38.75g

3rd Half life

38.75÷2

=19.375g

You might be interested in
Nguyen played a game in which he could either lose or gain points each round. at the end of 7 rounds, he had -8 points. After on
Sergeeva-Olga [200]

Answer:

I think the answer would be +15.

Step-by-step explanation:

3 0
2 years ago
Can someone please help me?
omeli [17]

Answer:

The answer would be Part F

8 0
2 years ago
Bill and Lisa are surveying their classmates about their summer reading. Their questions are given below:
Rina8888 [55]
It is my unprofessional opinion that the answer will be c.
my reasoning is because Lisa is asking for a percentage from a set amount<span />
7 0
3 years ago
Bernard solved the equation 5x+(-4)=6x+4 using algebra tiles.Which explains why Bernard added 5 negative x-tiles to both sides i
Volgvan
5x+(-4)-5x=6x+4-5x
-4=x+4
x=-8

To get rid of 5x on the left side.
6 0
3 years ago
Read 2 more answers
The value of the expression 16 -3/4 is ______.
Korvikt [17]
16-3/4=15 1/4

You can convert to fractions first, and then convert back to a mixed number like:

16/1-3/4  and when you add/subtract fractions you need a common denominator

64/4-3/4

61/4

15 1/4

Or you can convert your fraction to a decimal to get:

16-0.75

15.25
3 0
3 years ago
Read 2 more answers
Other questions:
  • What is -1 OVER 7 Multiplyed by 1 over 5
    12·1 answer
  • Find the distance represented by 2.6 in. if the scale 1 in. = 50 mi. is used.
    11·1 answer
  • Sally used 29% of a weeks paycheck to buy groceries. If she paid $60.90. For groceries, how much was her paycheck that week
    12·2 answers
  • In Exercise, expand the logarithmic expression.<br> ln(x + 1)2
    15·1 answer
  • What is the rate of change between the interval x= pi and x= 3pi/2
    9·1 answer
  • Consider the differential equation 4y'' â 4y' + y = 0; ex/2, xex/2. Verify that the functions ex/2 and xex/2 form a fundamental
    12·1 answer
  • A new car valued at 24,000 depreciates at 9% per year. What is the value of the car one year after purchase?
    10·1 answer
  • One employee earns a weekly salary of $500, and another works hourly, making $10 per hour. How many hours does the hourly employ
    6·2 answers
  • Which models represent the sum?<br><br><br>1.1 + 0.6<br><br><br>Select each correct answer.
    8·1 answer
  • What is the quotient (6x4 − 15x3 + 10x2 − 10x + 4) ÷ (3x2 + 2)?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!