Situation:
A 45 gram sample of a substance that's
used to sterilize surgical instruments has
a k-value of 0.15.
N = Noe kt
No initial mass (at time t = 0)
N= mass at time t
k= a positive constant that depends on
the substance itself and on the units
used to measure time
t-time, in days
Find the substance's half-life, in days.
Round your answer to the nearest tenth.
Enter the correct answer.
DONE
+?
The substance's half-life is 4.7 days if the 11-gram sample of a substance that’s used to treat thyroid disorders has a k- the value of 0.15
What is exponential decay?During exponential decay, a quantity falls slowly at first before rapidly decreasing. The exponential decay formula is used to calculate population decline and can also be used to calculate half-life.
We have an exponential function:
\(\rm N = N_oe^{-kt}\)
Plug N = N⁰/2
\(\rm N_o/2 = N_oe^{-kt}\)
\(\rm \dfrac{1}{2} = e^{-0.15t}\)
Solving for t:
t = 4.62≈ 4.7 days
Thus, the substance's half-life is 4.7 days if the 11-gram sample of a substance that’s used to treat thyroid disorders has a k- the value of 0.15
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When multiplying or dividing both sides of an inequality by a negative number, you need to remember to "flip" the inequality sign.
True or False
That is a true statement
Step-by-step explanation:
true................
I need help finding the M and the B
The values of M and B are the slope and y-intercept of the linear equation on graph A.
We will see that the slope is 2 and the y-intercept is 1.
How to find the values of M and B?I assume that with "M and B" you refer to the slope and y-intercept of the line on the graph surrounded by a blue line, which is the first one.
Where this is a linear equation, and we know that a linear equation is written as:
y = m*x + b
The value of b is the value that y takes when the line intercepts the y-axis.
On graph A we can see that the line intercepts the y-axis at the value:
y = 1
Then b = 1.
So the linear equation is something like:
y = m*x + 1
To find the value of m we can identify other point on the graph, we can see that the line passes through (1, 3), replacing these values on the linear equation we get:
3 = m*1 + 1
3 = m + 1
3 - 1 =m
2 = m
Then the linear equation on graph A is:
y = 2x + 1
The value of M is 2 and the value of B is 1
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49 7 because (-7) (-7) = -49
Answer:
nope ummm a negative number times another negative is positive. whats your question tho?
Anybody else have to have google teach them something? (free pts)
Like i had to google something just to understand what it was.
Answer:
sometimes
Step-by-step explanation:
Answer:
Yes! All the time!
Step-by-step explanation:
What is the average of the points A, B and C with weights 1, 1
and 1
respectively?
The average of the 3 points A, B, and C is 1/3
How to find the average of the 3 points?We know that for a set of N values {x₁, x₂, ..., xₙ} the average is:
Average = (x₁ + ... + xₙ)/N
Assuming that all the weights are 1.
Here the values (y values) for the 3 points are:
A = -9
B = 2
C = 8
The average of these 3 points is:
average = (-9 + 2 + 8)/3
average = 1/3
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The segment shown is half of AB, where B(-5, 1) is one endpoint of the segment and M(-3, 3) is the midpoint of the segment. What are the coordinates of point A?
I would really appreciate help because I’m super confused, thank you:))
Answer:
(-1,5)
Step-by-step explanation:
For point (x1,y1) and (x2,y2) on coordinate plane if m is the midpoint of these points, then coordinate of mid point is given by
(x1+x2)/2, (y1+y2)/ 2
________________________________
Given point
B= (-5,1)
M = (-3,3)
we have to find point A, let it be (x,y
using the above formula , midpoint m is
-3= (-5+x)/ 2 3= (1+y)/ 2
-3*2= -5+x 6= 1 +y
-6 +5 = x 6-1 =y
x = -1 y = 5
Thus, the coordinates of point A is(-1,5).
Gabriella drives her car 440 miles and averages a certain speed. If the average speed had been 9 mph less, she could have traveled only 380 miles in the same lengthof time. What is her average speed?
Gabriella's average speed was 66 mph.
Let's call Gabriella's average speed "s". We can set up two equations based on the information given:
Equation 1: d = rt
440 = s * t
Equation 2: d = rt
380 = (s - 9) * t
We want to solve for "s", so we need to eliminate "t" from these equations. We can do this by solving Equation 1 for "t":
t = 440 / s
And we can solve Equation 2 for "t" as well:
t = 380 / (s - 9)
Now we can set these equal to each other, since they both represent the same amount of time:
440 / s = 380 / (s - 9)
To solve for "s", we can cross-multiply and simplify:
440(s - 9) = 380s
440s - 3960 = 380s
60s = 3960
s = 66
Therefore, Gabriella's average speed was 66 mph.
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Points A' and B' are the images of points A and B after a 270 rotation about the origin. If the slope of line segment AB is -3, what is the slope of line segment A'B'? Put your answer in simplified fraction form with no spaces.
The slope of the line segment AB will change from -3 to 1/3 after a 270 degree rotation of the line segment
How to determine the slope of line segment A'B'information gotten from the question include
Points A' and B' are the images of points A and B after a 270 rotation
the slope of line segment AB is -3
Rotation is one of the movements that is under transformation it involves a movement about an axis.
With respect to the problem here, the axis of the rotation is the origin of the coordinates
The rotation will lead to formation of an image A'B' which is perpendicular to the preimage
The relationship between two slopes that are perpendicular to each other is
slope of line, m = -1/slope of the perpendicular line, m'
m' = -1/m
m' = -1/3
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POSSIBLE POINTS:
Jaedin invests $12,000 in an account that compounds interest annually. After three years, the account is worth $13,343.22. Use the function A = P(1 +
r), where r is the annual interest rate, P is the principal, and A is the amount of money after t years. What is the interest rate of the account?
The interest rate of the account is 3.6%.
Compound interest, also known as interest on principal and interest, is the practice of adding interest to the principal amount of a loan or deposit.
Jaedin places $12,000 in a savings account with yearly compound interest.
The account after three years is worth $13,343.22.
Therefore,
P = $12,000
A = $13,343.22
x = 3 years
n = 1 as the interest is compounded annually.
A = P( 1 + r/n )ⁿˣ where P is the principal amount, A is the final amount, n is the number of times compounded annually and x is the total number of years.
Therefore,
13,343.22 = 12000 × ( 1 + r/1 )³
( 1 + r )³ = 1.111935
1 + r = ∛1.111935
1 + r = 1.03600011
r = 1.03600011 - 1
r = 0.03600011
Therefore, the interest rate is 3.6%.
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what is foci of ellipse calculator?
An ellipse's form is determined by two locations inside the ellipse known as its foci.
The lengths of the main and minor axes of an ellipse may be used to calculate its foci.
The foci of an ellipse may be calculated using a variety of online calculators.
These calculators normally ask the user to enter the main and minor ellipse axes' lengths before calculating the foci's coordinates. Depending on the calculator in question, some may additionally ask for more details like the ellipse's eccentricity or center of rotation.
Understanding an ellipse's shape and characteristics requires knowing its foci since they are what characterize an ellipse.
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Which ordered pair is a solution to the system of linear equations 1/2x - 3/4y = 11/60 and 2/5x + 1/6y =3/10 ?
A. ( 1/5, -2/3 )
B. ( 1/5, 2/3 )
C. ( 2/3, -1/5 )
D. ( 2/3, 1/5 )
Answer:
D
Step-by-step explanation:
i multiplied the first equation by 60 to eliminate the fractions: 30x - 45y = 11
i multiplied the second equation by 30 to eliminate the fractions: 12x + 5y = 9
I graphed them and (2/3, 1/5) is the intersection of both lines
a rectangular garden has a length that is twice its width. the dimensions are increased so that the perimeter is doubled and the new shape is a square with an area of 3600 square feet. what was the area of the original garden, in square feet?
The area of the original garden is 7200 square feet.
Given,
a rectangular garden has a length that is twice its width. the dimensions are increased so that the perimeter is doubled and the new shape is a square with an area of 3600 square feet.
we are asked to determine the area of the original garden = ?
let the width be x
and the length be 2x
area of the square = 3600 sq feet
Perimeter of the rectangle = 2(l+b)
⇒ 2(2x+x)
⇒ 2(3x)=6x
area of square = a²
a² = 3600
a = √3600
a = 60
now we get the width = 60
length = 2(60)
= 120
Now calculate the area of the rectangle:
= l×b
= 60 × 120
= 7200
hence we get the area as 7200 square feet.
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can you guys help me with this math question
Answer:C
Step-by-step explanation:
Jeremy drove his motorcycle 120 miles in 3 hours. At this rate, how many
miles can he drive in 5 hours? At what rate did he drive his motorcycle?
120 miles
160 miles
200 miles
240 miles
Answer:
Jeremy drove 240 miles in 5 hours
There are seven houses, each containing seven cats. Each cat kills seven mice, each mouse would have eaten seven ears of corn. Each ear of corn would have produced seven sacks of grain. What is the total number of all of these items?
Multiplication is the process of multiplying, therefore, adding a number to itself for the number of times stated. The total number of all these items is 19,607.
What is multiplication?Multiplication is the process of multiplying, therefore, adding a number to itself for the number of times stated. For example, 3 × 4 means 3 is added to itself 4 times, and vice versa for the other number.
There are seven houses, each containing seven cats.
Number of house = 7Number of cars = 7 x 7 =49Each cat kills seven mice.
Number of mice = 49 x 7 = 343Each mouse would have eaten seven ears of corn.
Number of Ears of corns = 343 x 7 = 2401Each ear of corn would have produced seven sacks of grain.
Number of sack of grains = 2,401 x 7 = 16,807Now, the total number of all these items is,
Total number of items
= Number of house + Number of cars + Number of mice + Number of ears of corns + Number of sack of grains
= 7 + 49 + 343 + 2401 + 16807
= 19,607
Hence, the total number of all these items is 19,607.
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What is the slope-intercept equation for this line?
Solution:
Step-1: Find the slope of the line.
Formula: Rise/Run = y₂ - y₁/x₂ - x₁
y₂ - y₁/x₂ - x₁ = Slope=> -2 - (-1)/4 - 0 = Slope=> -2 + 1/4 - 0 = Slope=> -1/4 = SlopeStep-2: Find the y-intercept of the line.
The y-intercept of the line is the point that intersects the y-axis.
=> y-intercept = -1Step-3: Create the equation.
=> y = (m)x + (b) => \(y = -\frac{1}{4} x - 1\)PLS HELP I WILL GIVE BRIANLY
A house is full of some cats and dogs. They are put in there in the ratio 1:5. If there are 8 cats in the house, how many dogs are there?
Answer:
40 dogs
Step-by-step explanation:
Since for every 1 cat there are 5 dogs
You can multiply 8 by 5 to get 40
Answer:
40 dogs
Step-by-step explanation:
if the ratio is 1:5 and the cats are 8, that means the number of dogs in the hous is 5 times larger than the cats. 8*5=40
There are 40 dogs in the house.
Hope this helps!
:)
help tyyyyyyy. pplzzz
Answer:
10 13/16
Step-by-step explanation:
Answer detailed please
Answer:
container A
Step-by-step explanation:
In Container A, we can plot the points (0,60) adn (2, 35)
The slope is :
\(m_A = \frac{y_2-y_1}{x_2-x_1} \\\\= \frac{35-60}{2-0} \\\\= \frac{-25}{2}\\ \\m_A = -12.5\\\)
For container B, the slope is:
\(m_B = \frac{y_2-y_1}{x_2-x_1} \\\\= \frac{32-54}{3-1} \\\\= \frac{-22}{2}\\ \\m_B = -11\\\)
The negative sign of the slope indicates the direction of the slope
\(|m_A| = 12.5\\\\|m_B| = 11\)
12.5 > 11
The slope of container A is steeper than container B
Therefore, the water is draining out of container A at a faster rate than container B
Answer the attached question ASAP!!!
\({\large{\red{\mapsto{\maltese{\underline{\green{\boxed{\blue{\underbrace{\overbrace{\pink{\pmb{\bf{Answer:}}}}}}}}}}}}}}\)
A. (1,-3)
Part I -Selected Response For numbers 1a-1c, circle YES or NO for each statement using the table below.
Plz do 1c.
Answer:yes
Step-by-step explanation:
It’s the answe yes
Is -5/3 rational or irratuonal
Solve for x.
X
w+ 14 = 3x +qw+2
x=2w-11
x=5w+6
X=-2w+6
X=W-16
Answer:
⦿ \( x = -2w + 6 \)
Step-by-step explanation:
\( x - \dfrac{5}{2}w + 14 = 3x + \dfrac{6}{4}w + 2 \)
\( x - \dfrac{5}{2}w + 14 = 3x + \dfrac{3}{2}w + 2 \)
\( -2x - \dfrac{5}{2}w = \dfrac{3}{2}w - 12 \)
\( -2x = \dfrac{8}{2}w - 12 \)
\( -2x = 4w - 12 \)
\( x = -2w + 6 \)
what additional information could be used to prove δefg δe'f'g' using aas? check all that apply. eg
To prove that ΔEFG ≅ ΔE'F'G' using the Angle-Angle-Side (AAS) congruence criterion, we need additional information. The AAS criterion states that if two angles of one triangle are congruent to two angles of another triangle, and the included sides between these angles are congruent, then the triangles are congruent.
To prove ΔEFG ≅ ΔE'F'G' using AAS, we need the following additional information:
1. Angle congruence: We need to show that ∠E ≅ ∠E' and ∠F ≅ ∠F'. This means we need to know the measures or relationships between these angles. For example, if we know that ∠E = ∠E' and ∠F = ∠F', we can use angle congruence to support our proof.
2. Side congruence: We need to show that EF ≅ E'F'. This means we need to know the lengths or relationships between these sides. For example, if we know that EF = E'F', we can use side congruence to support our proof.
It is important to note that without this additional information, we cannot prove the congruence of ΔEFG and ΔE'F'G' using AAS (Angle-Angle-Side). Therefore, we must have specific information about angle and side congruence to establish the desired proof.
In summary, to prove ΔEFG ≅ ΔE'F'G' using AAS, we need information about the congruence of angles E and E', angles F and F', and the congruence of side EF and E'F'.
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An account pays 9% per year simple interest. In year 1, the amount in the
account is $750. How much is in the account in year 6?
Answer:
$405
Step-by-step explanation:
SI=PTR/100
=9*1*750/100
=$ 67.50
In 6 yrs= 67.50*6
=$405
Answer:
The answer is $1087.50
I got it wrong because someoneeeeeee didnt give the right answer (2 people to be exact)
View Policies Current Attempt in Progress Using the information provided in the table, the network diagram and the project completion time = 25 weeks, reduce the completion time of the project by 5 we
Strategies such as fast-tracking, crashing, prioritization, and resource optimization can be employed to reduce the project completion time by 5 weeks.
To reduce the completion time of the project by 5 weeks, we need to analyze the provided information and make appropriate adjustments. The initial completion time of the project is 25 weeks.
To achieve a reduction of 5 weeks, we can consider several strategies:
1. Fast-tracking: This involves overlapping or parallelizing certain project activities that were initially planned to be executed sequentially. By identifying tasks that can be performed concurrently, we can potentially save time. However, it's important to evaluate the impact on resource allocation and potential risks associated with fast-tracking.
2. Crashing: This strategy focuses on expediting critical activities by adding more resources or adopting alternative approaches to complete them faster. By compressing the schedule of critical tasks, we can reduce the overall project duration. However, this may come at an additional cost.
3. Prioritization: By reevaluating the project tasks and their priorities, we can allocate resources more efficiently. This ensures that critical activities receive higher attention and are completed earlier, resulting in an accelerated project timeline.
4. Resource optimization: Analyzing the resource allocation and identifying potential areas for optimization can lead to time savings. By ensuring that resources are utilized effectively and efficiently, we can streamline the project execution process.
It's important to note that implementing any of these strategies requires careful evaluation, considering factors such as project constraints, risks, cost implications, and stakeholder agreements. A comprehensive analysis of the project plan, resource availability, and critical path can guide the decision-making process for reducing the project completion time.
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How many solutions does this equation have? -8x= -8x .
Answer:
Infinite
Step-by-step explanation:
No matter what number you plug into x, since it is multiplied by the same coefficient on both sides, the two sides will still be equal. Therefore, there are infinite solutions. Hope this helps!
Answer:
This equation has infinite solutions.
Step-by-step explanation:
The equation parts are literally the same.
-8x=-8x
If x=2
-16=-16
If x=1,000
-8,000=-8,000
and so on...
A hotel sets up tables for a conference for 156 people. If each table seats 12 people, how many tables will be needed? Use an area model to help. 13 tables
Answer:
13 tables
Np btw
If the change in y equals 10 and the change in x equals -5, then
the slope of the curve is positive.
the slope of the curve is negative.
the curve must be a straight line.
the slope cannot be calculated without more information.