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
LuckyWell [14K]
1 year ago
14

The half-life of lead is 18 years. How long will it take for the sample of this substance to decay to 15%?a. Find your k

Mathematics
1 answer:
ipn [44]1 year ago
7 0

Solution

We are given

Half Life = 18 years

To solve for k

\begin{gathered} 0.5=e^{-18k} \\ ln(0.5)=-18k \\ k=-\frac{ln(0.5)}{18} \\ k=0.0385081767 \end{gathered}

You might be interested in
77.3003 to 3 significant digits
Mama L [17]

Answer:

77.3

Step-by-step explanation:

Decimal notation: 77.3

No. of significant figures: 3

No. of decimals: 1

Scientific notation: 7.73 × 101  

Steps:

#1: 77.3003 (the original number has 6 sig figs)

#2: 77.3 (rounded to 3 significant figures)

8 0
2 years ago
Plz can someone answer this?
jeka57 [31]

Answer:

I belive it is 4 but im only 78% sure

Step-by-step explanation:

 

5 0
4 years ago
The surface area of two similar solids are 340yd^2 and 1,158yd^2. The volume of the larger solid is 1,712yd^2. What is the volum
solong [7]
The ratio of the areas is 340/1158 = 170/579thus the ratio of the side lengths is sqrt(170)/sqrt(579)  = .5418the ratio of volumes is the side length ratio cubed = .5418^3 = .159Volume of smaller solid  = (.159)(1712) = 272.37
7 0
3 years ago
How can you Express 3 3/8 as a fraction ?​
Solnce55 [7]

Answer:

You mean improper fraction?

3 x 8 = 24

24 + 3 = 27

27/8

3 0
3 years ago
In the first quarter of 2010, U.S. advertisers spent $5.9 billion on online
Katyanochek1 [597]

Answer:

$1.4 B per year

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • A shop stocks 30 bottles of shampoo. Felix buys 2/5 of bottles and Anita buys 3/10 of the bottles. How many bottles of shampoo d
    11·2 answers
  • A drawer contains one pair of brown socks and one pair of white socks the table shows the possible outcomes
    9·2 answers
  • X+5&gt;2<br> pls help <br> 1: what do you have to do to each side to solve this equation?
    9·1 answer
  • The integer whose product with (-1) is 22 is​
    8·1 answer
  • Which of the following formulas would find the surface are of a right cylinder where h is the height, r is the radius, and BA is
    14·1 answer
  • ILL MARK BRAINLIST !!! JUST THE ANSWER !!!!
    5·2 answers
  • What is the point-slope form of the equation of a
    7·1 answer
  • 8.<br> (19x - 18)<br> (10x -9<br> (7x+1)
    14·1 answer
  • write a quadratic function in vetex form whose graph has the vertex (-1, 16) and passes through the point (-2,34)
    9·2 answers
  • May I please get help
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!