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
nikitadnepr [17]
3 years ago
7

A 18 gram sample of a substance that's used to detect explosives has a k value of0.125

Mathematics
1 answer:
mr Goodwill [35]3 years ago
4 0
T1/2 = ln 2 / k = ln 2 / 0.125 = <span>5.5</span>
You might be interested in
Please help right in <br>y=mx+b form
slavikrds [6]
Y=2/2x+0
hope this helps

ps~~u dont need that 0
4 0
3 years ago
A circular swimming pool has a diameter of 40 meters. The depth of the pool is constant along west-east lines and increases line
Nataliya [291]

Answer:

Volume is 2000\pi\ m^{3}

Solution:

As per the question:

Diameter, d = 40 m

Radius, r = 20 m

Now,

From north to south, we consider this vertical distance as 'y' and height, h varies linearly as a function of y:

iff

h(y) = cy + d

Then

when y = 1 m

h(- 20) = 1 m

1 = c.(- 20) + d = - 20c + d              (1)

when y = 9 m

h(20) = 9 m

9 = c.20 + d = 20c + d                  (2)

Adding eqn (1) and (2)

d = 5 m

Using d = 5 in eqn (2), we get:

c = \frac{1}{5}

Therefore,

h(y) = \frac{1}{5}y + 5

Now, the Volume of the pool is given by:

V = \int h(y)dA

where

A = r\theta

A = rdr\ d\theta

Thus

V = \int (\frac{1}{5}y + 5)dA

V = \int_{0}^{2\pi}\int_{0}^{20} (\frac{1}{5}rsin\theta + 5) rdr\ d\theta

V = \int_{0}^{2\pi}\int_{0}^{20} (\frac{1}{5}r^{2}sin\theta + 5r}) dr\ d\theta

V = \int_{0}^{2\pi} (\frac{1}{15}20^{3}sin\theta + 1000) d\theta

V = [- 533.33cos\theta + 1000\theta]_{0}^{2\pi}

V = 0 + 2\pi \times 1000 = 2000\pi\ m^{3}

7 0
3 years ago
Then add five pairs of your own explaining their connotative differences
olasank [31]
1. Crippled, Disabled 
Crippled is almost sound like a discriminating word and have a negative connotation where as disabled is more polished and reverent.
 2. Relaxed, Easy-going
 Both seem same but relaxed refers to free, pleasure and stress free but easy-going implies not serious and laziness.
 3. Knockout, Beautiful
 Knockout mainly used to imply someone is sex y where as beautiful is simple compliment for a person.
 4. Young, Immature
 Sometimes both are used in the same context but youth may be always a substitute for immature.
 5. Skinny, Thi n Both are almost similar but actually someone skinny is called thin.

4 0
3 years ago
The ratio of boys to girls in the school is 4:3 if there were 16 boys how many girls at in band?
larisa86 [58]

Answer:

12 girls

Step-by-step explanation:

16 divided by 4 is 4

Since the ratio is 4:3, that means that for every 4 boys, there are three girls.

3 x 4 is 12

Your answer is 12 girls.

7 0
2 years ago
The cost of staying one night at a hotel in amber city is $59. The cost of staying one night at a hotel in bear lake is $159. Fi
Sloan [31]
If you stay in amber city you waste $295 but if you go to bear lake your wasting around $795 so your saving $500
7 0
3 years ago
Other questions:
  • What is the equation of the line that passes through (4, -1) and (-2, 3)?
    9·1 answer
  • Solve the system of linear equations by elimination X + 3Y =5 -x -y = -3
    13·1 answer
  • 43 1/3 rounded​ to the nearest whole number
    5·2 answers
  • What is 20 over 10 in a mixed number
    7·2 answers
  • PLEASE HELP AND SHOW WORK!! i'm terrible, literally terrible at math, just explain it to me, please ? i need both x and y!
    11·1 answer
  • I don't get # 2 please help and fast
    10·1 answer
  • Solve for x: −3(x + 3) = −3(x + 1) − 5. (1 point) a 6 b −6 c All real numbers d No solution
    11·2 answers
  • Which transformation is a translation?
    14·1 answer
  • Plot the intercepts to graph the equation. x+y=3
    13·1 answer
  • What are the terms in the expression 7x+4y+1?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!