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
serious [3.7K]
3 years ago
7

Colbalt-60 has half-life of about 5 years, How many grams of a 300 g sample will remain after 20 years?

Mathematics
2 answers:
ZanzabumX [31]3 years ago
5 0

Answer:

After 20 years 18.75 gm of sample will remain.

Step-by-step explanation:

Rashid [163]3 years ago
4 0

The half-life is the time it takes for any amount of Cobalt-60 to decay to half the starting amount.

20 years is 4 times the half-life of 5 years. So there would be

(300 g) / 2⁴ = 18.75 g

remaining after 20 years.

In other words, after 5 years, 300 g decays to 150 g.

After another 5 years (total 10 years), 150 g decays to 75 g.

After another 5 years (total 15 years), 75 g decays to 37.5 g.

After another 5 years (total 20 years), 37.5 g decays to 18.75 g.

You might be interested in
Solve 5n=20 math right now please
maksim [4K]

Answer:

n=4

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Sally drives 66 miles in 3 hours and Molly drives 72 miles in 4 hours. What is the difference between their average speed, in mi
Scrat [10]

Answer: A


Step-by-step explanation:

Sally: 66/3=22

Molly: 72/4=18

22-18=4


5 0
3 years ago
Help me pleeeeeeeeeaze
kobusy [5.1K]

a(x+3) < 5x+15-x\\\\ax+3a < 5x+15-x\\\\ax+3a < 4x+15\ \ \ |-3a\\\\ax < 4x+15-3a\ \ \ \ |-4x\\\\ax-4x < 15-3a\\\\(a-4)x < 15-3a\\\\\text{The solution is all real numbers if}\ a-4=0\ \ \ |+4\\\\\boxed{a=4}\\\\\text{Check:}\\\\4(x+3) < 5x+15-x\\4x+12 < 4x+15\ \ \ \ |-4x\\12 < 15\ TRUE\to x\in\mathbb{R}

5 0
3 years ago
Please solve please and thank you
Dahasolnce [82]
(2x+2)(3x+1)
2x*3x+2x*1+2*3x+2*1
6x^2+2x+6x+2
6x^2+8x+2

Hope this helped
6 0
3 years ago
Read 2 more answers
Let A = {1,2,3,..., 8, 9, 10} B = {4, 7, 10}
Dovator [93]

The answers to the questions are

(i) B - A = Ф / null set

(ii) A - B = {1, 2, 3, 5, 6, 8, 9}

(iii) (A - B) ∩ (B - A) = Ф / null set

(iv)  (A - B) ∪ (B - A) = {1, 2, 3, 5, 6, 8, 9}

A set contains different elements which are mathematical objects of any kind such as numbers, points, spaces, lines e.t.c.

Different types of set are -singleton setsfinite and infinite setsempty or null sets equal sets unequal sets equivalent sets overlapping sets disjoint sets subsets super sets power sets universal sets

According to question,

i ] B - A = 0/null set

ii ] A - B = [ 1,2,3,5,6,8,9 ]

iii ]   (A-B) n (B-A) = 0/ null set

iv ]  (A-B) u ( B-A) = [ 1,2,3,5,6,8,9 ]

Hence, the answers to the questions are

(i) B - A = Ф / null set

(ii) A - B = {1, 2, 3, 5, 6, 8, 9}

(iii) (A - B) ∩ (B - A) = Ф / null set

(iv)  (A - B) ∪ (B - A) = {1, 2, 3, 5, 6, 8, 9}

To understand more about Set Theory refer - brainly.com/question/13458417#SPJ9

4 0
1 year ago
Other questions:
  • Prove that the left side equals to the right side:<br> (sin x/(1-cos x))+(sin x/(1+cos x))=2 csc x
    12·2 answers
  • Question 6 (5 points)
    7·1 answer
  • What is 4x6x8 length x width x height
    13·1 answer
  • (15 points) will mark the brainiest. Answer quickly and correctly!
    13·1 answer
  • Given: F(x) = 2x - 4; GX) = 3x + 2; Hpx)=x2<br> Find FG H(2)<br> 0 121<br> 27<br> 071
    13·2 answers
  • Find the values of x1 and x2 where the following two constraints intersect.
    8·1 answer
  • Slope of (-5,3)(2,1)​
    12·2 answers
  • Solve: 3,125 = 5-10 + 3x<br> DONE
    13·1 answer
  • 100 POINTS! I REALLY NEED TO GET THIS CORRECT
    10·2 answers
  • Find the value of x and z<br><br> 20 points lol
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!