a flea collar for dogs contains an active ingredient that evaporates at a rate proportional to the amount still present. half of the ingredient evaporates in the first 20 days after the collar is removed from the protective packaging. if the collar becomes ineffective after 70% of the active ingredient has evaporated, how many days does the collar remain effective?

Answers

Answer 1

Therefore ,the collar remain effective for 26.44 days.

Who defines order?

In mathematics, there are numerous ways to use the word "order." It most frequently refers to the quantity of elements in (for example, conjugacy class order, graph order, group order, etc.) or describes the biggest term (for example, curve order, surface order, or polynomial order) that appears in a mathematical object.

Here,

=>Rate of evaporation=k=dr/dt

=> amount still present=R.

Thus ,It's a first order reaction.

So, half life=0.693/k.

20=0.693/k.

=> k=0.0346

Now,

60% of active ingredient has been evaporated.

So, 40% left.

Time taken=T=(2.303/k)log(R/0.4R)

T=(2.303/0.0346)log(5/2)

T=66.56(log5-log2)

T=66.56(0.699-0.301)

T=66.56(0.398)

T=26.44 days.

Therefore ,the collar remain effective for 26.44 days.

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Related Questions

Beth's doll is similar to her own quilt by a ration of 1:6. if the width of her doll's quilt is 11 inches, how wide is her own quilt in inches?

Answers

Answer:
66
Step-by-step explanation:
6*11=66

A TV that usually sells for $176.98 is on sale for 20% off. If sales tax on the TV is 9%, what is the price of the TV, including tax?

Answers

Answer:

i dont know

Step-by-step explanation:

hi

what is the product of x and y values 2x+8y=24 -7x-6y=26

Answers

Answer:

x= -8

y=5

Step-by-step explanation:

2x + 8y =24

2(x+4y)=24

x+4y=24/2

x+4y=12

x=12-4y

-7x-6y=26

-7(12-4y)-6y=26

22y-84=26

22y=26+84

22y=110

y=110/22

y=5

x=12-4y

x=12-4×5

x= -8


Sara's volleyball team has white jerseys and green jerseys. The probability of wearing a white jersey to a game is the same as
the probability of wearing a green jersey Sara drew a tree diagram to calculate all the possible outcomes for wearing jerseys to
three games.



What is the probability that she will wear her green jersey 3 times in a row ?

Answers

Answer:

1.5 or 50%

Step-by-step explanation:

A roller coaster goes down 0 feet and then up 55 feet.

Answers

Answer:

was that the full question? i cant seem to understand what your asking

Step-by-step explanation:

what do you need help with ??

If 4 children drink 24 ounces of milk everyday then how much do they drink in a week? (if this shows up twice sorry i didn't know)

Answers

Answer:

168

Step-by-step explanation:

24x7=168

Answer:

In total, the amount of milk every kid combined drank is 672 ounces.

Step-by-step explanation:

If four kids drank 24 ounces of milk for seven days, you would solve it as follows:

First, the amount all the kids drink in one day combined is 96 ounces.

If they drink 96 per day, and they do so for a week (7 days), then that is 96 × 7 because its 96 seven times.

7 × 96 = 672

i don’t understand explain

Answers

Answer:

62

Step-by-step explanation:

y+94+137+67= 360

y=62

HELP plz! Select yes or no for each.

Answers

Answer:

no

no

yes

Step-by-step explanation:

need help asap please!!!

Answers

Answer:

251.32741

Step-by-step explanation: Later Surface Area Formula: 2(pi)rh

For each formula,rearrange so a is by itself:
6-9b=3a
6b+2a=3a
a/3=b+2

please explain how to do that i have a test in 2 days

Answers

Step-by-step explanation:

a) 6-9b=3a

First:Subtract

3b=3a

Second: Devide

3b/3a

=(3÷3)(b÷a)

=1b/a

= b/a

B) 6b+2a=3a

First:Transpose (Group the like terms. signs will change.)

-3a+2a=-6b

=-1a=-6b

Second:Divide

=-1a/-6b:(-1÷-6)(a÷b)

=1a/6b

=a/6b

C)a/3=b+2

First: Transpose

a=3+2+b

=a/6+b

100 POINTS AND BRAINLIEST

What is the common difference of the arithmetic sequence? −17, −13, −9, −5, −1

A) -17
B) -13
C) 4
D) -4

Answers

Answer:

The common difference is 4 or C on your test

Step-by-step explanation:

-17+4= -13

-13+4= -9

And so on...

PLEASE HELP MY MATH GRADE IS LOW AND THIS IS THE ONLY WAY TO GET IT UPPPPP PLEASE I WILL MARK U BRAINLEST PLEASE TRY YOUR BEST THANKSSS SO MUCH

Answers

I can barely see do you have email of it

Answer:

I can't see!

Step-by-step explanation:

Bert is planning to open a savings account that eams 1.6% simple interest yearly. He wants to earn exactly $224 in interest after
2 years. How much money should he deposit?
A. $7,000
B. $3,584
C. $70
D. $700

Answers

Answer is:

$7,000 x 1.6% = $112
$112 x 2 years = 224

Plzzzzzzzz helpppppppppopoppoopoloool

Answers

Answer:

x have to be equal to 3

Step-by-step explanation:

Mathematically, when two triangles are similar, the ratios of their corresponding sides are equal

Thus, we have it that;

AB/AC = DE/DF

9/3(x-1) = 6/x + 1

9(x + 1) = 6(3(x-1))

9x + 9 = 18x - 18

18x-9x = 9 + 18

9x = 27

x = 27/9

x = 3

Which of the following expressions are equivalent to -(-8/-4)
1. -(-8/4)
2. 2
3. none of the above

Answers

Answer:

None of the above

Step-by-step explanation:

a and b are positive integers and a-b=2. Evaluate the following:
9^1/2^b/3^a

Answers

Answer: 1/9

Step by step explanation:

Answer:

1/9

Step-by-step explanation:

De las siguientes oraciones ¿Cuál es una proposición?
a)El sol es una estrella
b)El autor de "La vida es sueño"
c)¡Pon atención!
d)¿Cuándo es el examen de historia?

Answers

Answer:

c

Step-by-step explanation:

Answer:

translation: Of the following sentences, which is a proposition? a) The sun is a star b) The author of "Life is a dream" c) Pay attention! d) When is the history exam also its c i think

Step-by-step explanation:

If f(x) = x2 and g(x) = 3x + 1, then g(f(2))= ?

Answers

Answer:

The value of g[f(2)] = 13

Step-by-step explanation:

Given functions:

f(x) = x²

g(x) = 3x + 1

Find:

The value of g[f(2)]

Computation:

f(x) = x²

By putting x = 2 in f(x)

f(x) = x²

f(2) = 2²

f(2) = 2 × 2

f(2) = 4

So the value of f(2) = 4

Value of  f(2) putting in g(x)

g(x) = 3x + 1

g(x) = 3x + 1

g[f(2)] = 3[f(2)] + 1

We know that f(2) = 4

So,

g[f(2)] = 3[f(2)] + 1

g[f(2)] = 3[4] + 1

g[f(2)] = 12 + 1

g[f(2)] = 13

The value of g[f(2)] = 13

Lionel is planning a one-day outing.
The Thrill amusement park charges an entry fee of $40 and an additional $5 per ride, x. The Splash water park charges an entry fee of $60 and
an additional $3 per ride,
Based on this Information, which system of equations could be used to determine the solution where the cost per ride of the two amusement
parks, y, ls the same?

Answers

y is the same sorry if i’m incorrect

Answer:

the correct answer is

[tex]y=\frac{5x+40}{x} \\ \\y=\frac{3x+60}{x}[/tex]

Step-by-step explanation:

PLEASE GIVE ME A GOOD ANSWER FOR THIS PAGE THIS WILL BE 25 PT AND HOPEFULLY IF SOMEONE IS NICE ENOUGH to put a second answer so I can give a brainliest ^-^

Answers

Question 2:  She needs $16 more dollars to reach $60.

Question 3:  He made a profit of $1,134.

Question 4:  Yes, he will have enough to by the game.  The exact cost of the game (including tax) is $46.99135.  Stephen has $55.50.  Therefore he has enough to buy the game.

Question 5:  The moving company should be paid $736.  

If you want me to include all the calculations, I would gladly do so.

I couldnt do question 6 because the image was unclear.  My apologize for the inconvenience.

Wwwwwwwwwwwwwwwwwwwwwwwwww

Answers

Answer:

84

Step-by-step explanation:

reqd. area=outer area-inner area

=20*15-18*12

=300-216

=84 square inches

4. Using the formula below, solve when S=1.50
A = 6s2

Answers

the answer would be 13.5

1.5^2=2.25

6x2.25=13.5

does anybody know the answer?

Answers

Step-by-step explanation:

y=3/4x+1

because we resiprocal the -3/4x+1

Ramon has a picture that measures 2 inches in length and 3 inches in width. He wants to enlarge the picture to fit on a picture frame that is 14 inches long. How wide will the picture frame need to be in order to create a similar figure?
A. 21 inches
B.9 1/3 inches
C. 6 inches
D. 84 inches
NO LINKS OR I WILL RPORT YOU ​

Answers

Answer:

The frame would be 21 inches wide

Step-by-step explanation:

set up ratio of 2/3 and 14/x

then solve for x

Answer:9 1/3

Step-by-step explanation:

maxim is making new cushion covers for a chair. there are three sizes of cushions on the chair. what is the surface area of the arm rest cushion?

Answers

Answer:

its C

Step-by-step explanation:

a P e X

Ayden wants to sell a total of $150 worth of candy bars for his school fundraiser. Each candy bar costs $1.50. How many candy bars will he have to sell in order to meet his goal?

Answers

Answer:

100 Candy Bars

Step-by-step explanation:

Hey!

==================================================================

Ayden wants to sell a total of $150 worth of candy bars for his school fundraiser. Each candy bar costs $1.50. How many candy bars will he have to sell in order to meet his goal?

--------------------------------------------------------------------------------------------------------------

We can create an algebraic Equation to solve this.

- We know that Each Candy Bar costs $1.50.

-We multiply the Amount of Candy Bars with the price.

-We know the profit should be $150

⇒ 1.50x = 150

-Divide by 1.50 on both sides

⇒ 1.50x/1.50 = 150/1.50

-Simplify

⇒ x = 100

==================================================================

Hope I Helped, Feel free to ask any questions to clarify :)

Have a great day!

More Love, More Peace, Less Hate.

       -Aadi x

2. What is the coordinate of the final image of vertex T
after the triangle is translated 3 units to the left and 2
units up?


Please help with number 2

Answers

Answer:

We have the coordinates of vertex T after the translation as (-5,0)

Step-by-step explanation:

Firstly, we get the coordinates of vertex T

we have this as;

(-2,-2)

Translating to the left means we are going to subtract the specific units from the x-coordinate

2 units up means we are going to add to the y-coordinate value

So, we have it that;

(-2-3, -2+ 2) = (-5,0)

Please help me with this fast

Answers

Answer:

X = 111 degrees

Step-by-step explanation:

Try it out

5. In one year, there were 125 major new automobile types available. If you look at the miles per gallon (MPG) for these vehicles, the distributions are roughly normal. The means and standard deviations are given by: Mean Standard Deviation City MPG 22.37 4.77 Highway MPG 29.09 5.46 a. The Honda Civic had a rating of 45 highway MPG. What is the probability that your car has a worse highway gas mileage than the Civic? b. The Lincoln Continental had a rating of 17 city MPG. What percent of cars are likely to have a better city gas mileage than the Continental?

Answers

Answer:

The answer is "99.82% and 86.99%".

Step-by-step explanation:

In point a:

[tex]=P(X < 45)\\\\= P(Z < \frac{45-29.09}{5.46}) \\\\=P(Z < 2.9139)\\\\=0.9982\\\\=99.82\%[/tex]

In point b:

[tex]=P(X >17)\\\\= P(Z > \frac{17-22.37}{4.77}) \\\\=P(Z > -1.1258)\\\\=0.8699\\\\=86.99\% \\\\[/tex]

what is the least common denominator between 3/4 4/5 and 2/3

Answers

Answer:

The Least Common Denominator of 3/4, 4/5 and 2/3

Would be,

4 × 5 × 3 = 60

Hence,

60 is the L.C.D of 3/4, 4/5 and 2/3

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