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
yawa3891 [41]
3 years ago
6

If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years? A. 5 grams B. 10 g

rams C. 20 grams D. 30 grams
Biology
2 answers:
satela [25.4K]3 years ago
8 0

Answer:

c. 20

Explanation:

tatiyna3 years ago
6 0
60 years is three half life for the substance, so 40*1/2^3=5
You might be interested in
Urgent please help!!!!!
antiseptic1488 [7]
I think the answer is most likely be J.

The first (F) one the population of the predator increases hugely while the population of the prey was neutral. And so both population didn’t seem to have any connection. Same goes for H. Graph G doesn’t make sense at all the population of the prey didn’t exist throughout the time in the graph but only exist in one single point of time and then just vanish again so that shouldn’t be the answer either.
In graph J, you can see the correlation between the two populations as the predator goes up and so does the prey.
You can search up on google predator-prey relationship graph to get better understanding.
6 0
3 years ago
11. Write the complementary sequence to following DNA strand:
rusak2 [61]

Answer: T T A A G C G G C CA TAA T C T G CTT

Explanation: The A's always pair with T's.    The G's always pair with C's.

3 0
2 years ago
Which best describes a hypothesis
Arlecino [84]
An educated guess is the best way to describe hypothesis
7 0
3 years ago
Read 2 more answers
Hypotheses are used in science but never in the design of new technology.<br><br> True False
timofeeve [1]
True if u know that humans are
4 0
3 years ago
How does the covering of the bats and eagles forelimbs different
skad [1K]
Bat wings are made of a rubbery substance while eagles wings are covered in feathers
3 0
3 years ago
Other questions:
  • What does cyclical mean
    7·1 answer
  • E. coli cells grown on 15n medium are transferred to 14n medium and allowed to grow for two more generations (two rounds of dna
    8·1 answer
  • Explain why crops in the arctic grow larger than normal during the summer months
    5·2 answers
  • What is not contained in our blood?
    7·2 answers
  • Explain the opening analogy of an efficiency apartment and a mansion as it relates to cells and how it applies to cell structure
    5·1 answer
  • Select the correct answer from each drop-down menu.
    12·1 answer
  • Read the passage below about acupuncture.
    7·2 answers
  • 6. All of the following are factors that affect ecosystems EXCEPT
    10·1 answer
  • What do cells need to divide?​
    10·2 answers
  • What is the highest level of organization that ecologists study?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!