Convert the point to polar coordinates using the interval [0, 2\small \pi) for θ. Show all work.
Answers
We know that polar coordinates are defined as:
[tex]\begin{gathered} r=\sqrt[]{x^2+y^2} \\ \theta=\tan ^{-1}(\frac{y}{x}) \end{gathered}[/tex]in this case we have the point (-2,-2); this means that x=-2 and y=-2. Plugging this value for the radius we have that:
[tex]\begin{gathered} r=\sqrt[]{(-2)^2+(-2)^2} \\ r=\sqrt[]{4+4} \\ r=\sqrt[]{2\cdot4} \\ r=2\sqrt[]{2} \end{gathered}[/tex]Plugging the values for the angle we have:
[tex]\begin{gathered} \theta=\tan ^{-1}(\frac{-2}{-2}) \\ \theta=\tan ^{-1}(1) \\ \theta=\frac{\pi}{4} \end{gathered}[/tex]for the angle we need to be careful, we know that the point (-2,-2) in on the third quadrant, this means that the angle is greater than pi but when we use the formula we got pi/4; this comes from the fact that the formula for the angle determines the angle measure in the quadrant we are at. This means that we need to add the appropiate amount to the angle found by this formula to find the correct one. In this case, since we are on the third quadrant, we need to add pi to the angle we found, then we have:
[tex]\begin{gathered} \theta=\frac{\pi}{4}+\pi \\ \theta=\frac{\pi+4\pi}{4} \\ \theta=\frac{5\pi}{4} \end{gathered}[/tex]Hence the correct angle is 5pi/4.
Therefore the polar coordinates of the angle are:
[tex](2\sqrt[]{2},\frac{5\pi}{4})[/tex]Related Questions
Out of a group of 120 students, 28 said they ski and 52 said they snowboard. Sixteen of thestudents said they do both. If a student is chosen at random, find the probability that theysnowboard given they ski (Hint: Draw a Venn Diagram).
Answers
Given:
The total number of students = 128 students.
The number of students who play ski, N(S)= 28 students.
The number of students who play snowboard, N(B)= 52 students.
The number of students who play both ski and snowboard, N(S and B)= 16 students.
[tex]N(S\cap B)=16[/tex]Required:
We need to find the probability that they snowboard given they ski.
Explanation:
The ven diagram.
Consider the Conditional probability formula.
[tex]P(\frac{S}{B})=\frac{N(S\cap B)}{N(B)}[/tex][tex]Substitue\text{ }N(S\cap B)=16\text{ and N\lparen B\rparen=52 in the formula.}[/tex][tex]P(\frac{S}{B})=\frac{16}{52}[/tex][tex]P(\frac{S}{B})=\frac{4}{13}[/tex]Final answer:
The probability that they snowboard given they ski is 4/13.
Solve the equation. Justify each step using the word bank provided. *Properties may be used more than once!
Given
Addition Property of Equality
Subtraction Property of Equality
Multiplication Property of Equality
Division Property of Equality
Distributive Property
Combine
Like Terms
Justifications for each step:
2(x − 4) − 9 = 3(2x + 1) + 4
HELP PLEASE
Answers
The result of the equation 2(x − 4) − 9 = 3(2x + 1) + 4 by using the distributive property is x = -6
The equation is
2(x − 4) − 9 = 3(2x + 1) + 4
The distributive property states that multiplying the sum of two or more variables by a number will provide the same result as multiplying each variable individually by the number and then adding the products together.
The distributive property of the addition
A(B + C) = AB + AC
The distributive property of the subtraction
A(B - C) = AB - AC
The equation is
2(x − 4) − 9 = 3(2x + 1) + 4
Apply the distributive property
2x-8-9 = 6x+3+4
2x-17 = 6x+7
Rearrange the like terms and combine it
2x-6x = 7+17
-4x = 24
x = -6
Hence, the result of the equation 2(x − 4) − 9 = 3(2x + 1) + 4 by using the distributive property is x = -6
Learn more about distributive property here
brainly.com/question/13130806
#SPJ1
need help with this problem.
Answers
[tex]\cfrac{6^3\cdot 15^3}{(7^0)^3}\implies \cfrac{(6\cdot 15)^3}{(1)^3}\implies \cfrac{90^3}{1}\implies 729000[/tex]
4 years ago Lena won some money in the lottery and put it in a bank account that earns 6% interest compounded annually if Lena currently has $5,000 00 in the bank account how much interest has she earned round your answer to the nearest cent
Answers
Solution
For this case we can use the compound interest formula given by:
[tex]A=P(1+\frac{r}{n})^{nt}[/tex]and for this case A= 5000, r = 0.06, t= 4 and n = 1 ( compounded yearly)
[tex]A=5000(1+\frac{0.06}{1})^{1\cdot4}=6312.38[/tex]and the interest would be:
[tex]i=6312.38-5000=1312.38[/tex]What is the inverse of the function y = 2(x + 1)³?
Answers
Answer:
[tex]\sqrt{x}[/tex][tex]\sqrt[3]{1/2(x)}[/tex] - 1 = y
Step-by-step explanation:
Inverse: swap x and y
y =2(x+1)^3
x = 2(y + 1)^3
now put it in a y = mx + b form
x = 2(y + 1)^3
1/2(X) = (y+1)^3
[tex]\sqrt{x}[/tex][tex]\sqrt[3]{1/2(x)}[/tex]= y + 1
[tex]\sqrt{x}[/tex][tex]\sqrt[3]{1/2(x)}[/tex] - 1 = y
Pattern A Step 0 Step 1 pattern A or pattern B) shows a quadratic relationship?Step 2 Step 3 8 Pattern B Step 0 Step 1 Step 2 Step 3 2 a. How many dots will there be in Step 4 of each pattern? Pattern A = 16 dots Pattern B = 16 dots b. Which pattern (
Answers
Looking at pattern A, the rate at which the number of dots in increasing is linear. The common difference between the number of dots in consecutive steps is 2. The sequence formed is
4, 8, 12.......
The common difference is 8 - 4 = 12 - 8 = 4
Thus, the number of dots in step 4 is
12 + 4 = 16
Looking at pattern B, the sequence formed is
2, 3, 6, 11
3 - 1 = 1
6 - 3 = 3
11 - 6 = 5
We can see that the difference between consecutive terms is increasing by a constant value, 2. This means that the difference between the fourth term and the third term is 5 + 2 = 7
Thus, the number of dots in step 4 is
11 + 7 = 18
b) A quadratic sequence is one in which the second difference between any two consecutive terms is constant. The constant value for the second difference in pattern B is 2
Thus, pattern B is shows a quadratic relationship
I bought a suit that was on sale for 40% off the original price the original price of the suit was 260. How much did I save? and how much did I pay for the suit not including tax to the nearest dollar?
Answers
I saved 104
I payed 156
Explanations:% Discount = 40%
Original Price = 260
The amount I saved is the discount given
[tex]\begin{gathered} \text{Discount = }\frac{\%\text{ Discount}}{100}\times\text{ 260} \\ \text{Discount = }\frac{40}{100}\times260 \\ \text{Discount = 0.4}\times260 \\ \text{Discount = }104 \end{gathered}[/tex]Therefore, I saved 104
The amount payed = Original Price - Amount saved
Amount payed = 260 - 104
Amount payed = 156
Solve the following inequality for n. Write your answer in the simplest form.9n + 4 ≤ 6n - 6
Answers
Given,
The expression is,
[tex]9n+4\le6n-6[/tex]Substracting 4 from both sides then,
[tex]\begin{gathered} 9n+4-4\le6n-6-4 \\ 9n\le6n-10 \end{gathered}[/tex]Substracting 6n from both sides then,
[tex]\begin{gathered} 9n\le6n-10 \\ 9n-6n\le6n-6n-10 \\ 3n\le-10 \end{gathered}[/tex]Multiplying both sides by 1/3 then,
[tex]\begin{gathered} 3n\le-10 \\ 3n\times\frac{1}{3}\le-10\times\frac{1}{3} \\ n\le-\frac{10}{3} \end{gathered}[/tex]Hence, the solution for n is n<= (-10/3).
Pythagorean TheoremFor the following right triangle, find the side length x. Round your answer to the nearest hundredth.18Х11
Answers
Solution
For this case we can use the Pythagoras theorem and we have:
[tex]18^2=11^2+x^2[/tex]And solving for x we got:
[tex]x=\sqrt[]{18^2-11^2}=\sqrt[]{324-121}=\sqrt[]{203}=14.25[/tex]Then the answer is:
14.25
use nPr formula 11P0=
Answers
we know that
the formula is equal to
P(n,r) = n! / (n-r)!
we have that
nPr = n!/(n-r)!
we have
11P0
so
n=11
r=0
= 11!/(11-0)!
=11!/11!
=1
answer is 1Need help w whole paper
Answers
Answer:
it is 1+1=2 and 8+x(1230+8723)=27t9230
Step-by-step explanation:
its easy for me
what is the probability that Glenn will get a yellow marble
Answers
The bag has 5 marbles
3 yellow marbles
2 red marbles
"Glen chooses a marble first and then Kris chooses one" You have to determine the probability of Kris choosing a yellow marble if Glen chooses a yellow one first.
1. First you have to determine the probability that Glen choose a yellow marble first.
To do so, you have to calculate the quotient between the number of yellow marbles on the bag and the total number of marbles on the bag:
[tex]\begin{gathered} P(Y_1)=\frac{nº\text{yellow}}{\text{total}} \\ P(Y_1)=\frac{3}{5} \end{gathered}[/tex]2. and 3.
After Glen takes the first yellow marble from the bag, the total number of marbles is reduced by one and so is the number of yellow marbles on the bag, so:
New total: 4 marbles
Number of yellow marbles: 2
4.
To determine the probability of Kris choosing a yellow marble, you have to use the data on the remaining marbles on the bag. And calculate the quotient between the remaining number of yellow marbles and the remaining number of marbles:
[tex]\begin{gathered} P(Y_2)=\frac{2}{4} \\ P(Y_2)=\frac{1}{2} \end{gathered}[/tex]Find the area of the shadedSector in terms of π12 90
Answers
Consider the following figure:
Which expression is equivalent to 10x – 6?
Answers
Answer:
1. -6 + 10x
Step-by-step explanation:
The expression 10x – 6 is the same as adding -6 to 10x, or 10x + -6. Since addition equations can be rearranged, 10x + -6 can also be written as -6 + 10x.
Answer:
[tex] \sf{ \large{ - 6 + 10x}}[/tex]
Step-by-step explanation:
10x - 6
note: there is a plus sign at 10x
+10x - 6
so when you switch it will be like this
-6 + 10x
Solve Each system of equations.
-r + t = 5
-2r+t=4
Answers
Solve equations
-(1) + 6 = 5
5= 5
-2(1) + 6 = 4
4=4
_________
Step by step
We have two equations
-r + t = 5 to t = r + 5 when put in y intercept form for easy math
t = r + 5
-2r + t = 4
To solve, substitute the t value from the first equation for t in the second
-2r + (r + 5) = 4
Combine like terms
-1r + 5 = 4
Subtract 5 from both sides to solve for r
-1r + 5 - 5 = 4 - 5
Combine
-1r = -1
Divide both sides by -1 to solve for r
-1/-1 r = -1/-1
r = 1
Now substitute the r value into one of the equations to solve for t
(-1)(1) + t = 5
-1 + t = 5
Subtract (-1) from both sides to solve for
t = 6
Graph in the attachment
A laptop computer consumes about 40 watts of electricity per hour when operating. At $0.20 per kilowatt-hour, how much does a laptop cost to operate for 10 hours?A )8 centsB )800 centsC )40 centsD) 200 cents
Answers
A) 8 cents
Explanation
Step 1
find the rate
[tex]\begin{gathered} \text{rate}=\text{ 40 }\frac{\text{w}}{h} \\ \end{gathered}[/tex]cost
[tex]\begin{gathered} \text{ Cost= 0.20 per 1000 wats hour} \\ \end{gathered}[/tex]hence
total cost = time*rate*consume
[tex]\begin{gathered} \text{ Total cost = 10 hours}\cdot40\frac{w}{h}\cdot0.2\frac{\text{ \$}}{1000\text{ w}} \\ \text{ Total cost =}0.08\text{ dollars} \end{gathered}[/tex]now, to convert from dollars to cents, multply by 100
[tex]\text{ Total cost =}0.08\text{ dollars}\cdot(\frac{100\text{ cents}}{1\text{ dollar}})=8\text{ cents}[/tex]I hope this helps you
If f(x) = 4x - 1 and g(x)=2x-4, what is (fog)(x)?
Answers
The value of the composite function (f o g)(x) is 8x - 17
How to evaluate the function?The definition of the functions are given as
f(x) = 4x - 1
g(x) = 2x - 4
The composite function definition is given as
(f o g)(x)
This composite function is calculated using the following composite function formula
(f o g)(x)= f(g(x))
Substitute the known values in the above equation
So, we have the following equation
(f o g)(x) = 4(g(x)) - 1
So, we have the following equation
(f o g)(x) = 4(2x - 4) - 1
Open the brackets
(f o g)(x) = 8x - 16 - 1
Evaluate
(f o g)(x) = 8x - 17
Hence, the composite function is (f o g)(x) = 8x - 17
Read more about composite function at
brainly.com/question/10687170
#SPJ1
Dude I need help so if anyone can answer this for me that would be great!
5/6 ÷ -2/3
A -5/4
B -5/9
C 5/9
D 5/4
Answers
A fraction is written in the form of a numerator and a denominator where the denominator is greater than the numerator.
The final expression for this division of fraction 5/6 ÷ (-2/3) is -5/4.
What is a fraction?A fraction is written in the form of a numerator and a denominator where the denominator is greater than the numerator.
Example: 1/2, 1/3 is a fraction.
We have,
The division of two fraction:
5/6 ÷ (-2/3)
= (5/6) / (-2/3)
= 5/6 x (-3/2)
= (5 x (-3)) / (6 x 2)
= -5 x 3 / 6 x 2
= -5 / 4
Thus,
The final expression for this division of fraction 5/6 ÷ (-2/3) is -5/4.
Learn more about fractions here:
https://brainly.com/question/24370499
#SPJ1
The greatest common factor of 36 and 60 is 12. Explain what this means.
Answers
For 12 to be the GCF (Greatest common factor) between 36 and 60, means that the greatest number that can divide both 36 and 60 at the same time is 12.
An ice cream store has the pricing shown below. You want to determine the best value. The height of the cone is 4.5 in and the diameter is 2 in. The diameter of each scoop is 3 in. Assume the cone is stuffed full with ice cream.Question: Which size is the best value? Explain your reasoning using complete sentences.
Answers
Solution:
Step 1:
We will calculate the volume of ice cream in the single scoop
The volume of the ice cream will be
[tex]\begin{gathered} V=\frac{1}{3}\pi r^2h+\frac{2}{3}\pi r^3 \\ r=\frac{2in}{2}=1in(cone) \\ h=4.5in \\ r=\frac{3in}{2}=1.5in(radius\text{ of the hemisphere\rparen} \end{gathered}[/tex]By substituting the values, we will have
[tex]\begin{gathered} V=\frac{1}{3}\pi r^{2}h+\frac{2}{3}\pi r^{3} \\ V=\frac{1}{3}\times\frac{22}{7}\times1^2\times4.5+\frac{2}{3}\times\frac{22}{7}\times1.5^3 \\ V=\frac{33}{7}+\frac{99}{14} \\ V=\frac{165}{14} \\ V=11.79in^3 \end{gathered}[/tex]Step 2:
We will use the formula below to calculate the volume of the two scoops of ic cream
[tex]\begin{gathered} V=\frac{1}{3}\pi r^2h+\frac{4}{3}\pi r^3 \\ V=\frac{1}{3}\times\frac{22}{7}\times1^2\times4.5in+\frac{4}{3}\times\frac{22}{7}\times1.5^3 \\ V=\frac{33}{7}+\frac{99}{7} \\ V=\frac{132}{7} \\ V=18.86in^3 \end{gathered}[/tex]Step 3:
We will use the formula below to calculate the volume of the three scoops of ic cream
[tex]\begin{gathered} V=\frac{1}{3}\pi r^2h+\frac{6}{3}\pi r^3 \\ V=\frac{1}{3}\times\frac{22}{7}\times1^2\times4.5+2\times\frac{22}{7}\times1.5^3 \\ V=\frac{33}{7}+\frac{297}{14} \\ V=\frac{363}{14} \\ V=25.93in^3 \end{gathered}[/tex]For the first ice cream with one scoop
[tex]\begin{gathered} 1in^3=\frac{3.50}{11.79} \\ 1in^3=\text{ \$}0.30 \end{gathered}[/tex]For the second ice cream with two scoops
[tex]\begin{gathered} 1in^3=\frac{4.50}{18.86} \\ 1in^3=\text{ \$}0.24 \end{gathered}[/tex]For the third ice cream with three scoops
[tex]\begin{gathered} 1in^3=\frac{5.50}{25.93} \\ 1in^3=\text{ \$}0.21 \end{gathered}[/tex]Hence,
The final answer is
The triple sold at $5.50 has the best value because it has the lowest price of $0.21 per cubic inch of the ice cream
Higher Order Thinking Veronica needs to buy 13 pounds of cheese. When the clerk places some cheese in a container and weighs it, the scale shows 1 pounds. The container weighs pound. How many more pounds of cheese should be added to the scale to get the amount that Veronica needs? Explain how you solved the problem.
Answers
After calculating some basic arithmetic we have come to find that, 12 pounds of more cheese should be added to the scale to get the amount that Veronica needs which 23 pounds.
What is arithmetic?Using the four operations, arithmetic is a branch of mathematics that deals with the characteristics of numbers.
Division, multiplication, and subtraction are the four operations. The rules for each operation are very detailed.
As an illustration of arithmetic, one of the rules of addition and subtraction is that addition increases the overall value of a number while subtraction decreases the overall value of a number.
Veronica needs to buy 13 pounds of cheese
Cheese in a container weighs = 1 pounds
Mass of cheese clerk needs to add = 13 - 1
= 12 pounds
(as 1 pound is already there)
Thus, 12 pounds of more cheese should be added to the scale to get the amount that Veronica needs which 23 pounds.
Learn more about arithmetic
https://brainly.com/question/6561461
#SPJ9
Can someone explain to me how to find the answers
Answers
Part a: The missing length = 28 units.
Part b: The missing length = 25 units, for the given similar triangle.
What is termed as the similarity of the triangle?If two triangles' corresponding angles seem to be congruent and their corresponding sides are proportional, they are said to be similar. In other phrases, similar triangles have the same shape but may or may not be the same size. The triangles have been congruent if their side lengths are also of equal length.Part a: For the similar triangles.
Let the unknown value be x.
The, using the similarity of the triangle,
63/x = 27/12
x = (63×12)/27
x = 28 units.
The missing length is 28 units.
Part b: For the similar triangles.
Let the unknown value be x.
The, using the similarity of the triangle,
21/15 = (10 + x)/x
21x = 150 - 15x
6x = 150
x = 25
The missing length is 25 units.
To know more about the similarity of the triangle, here
https://brainly.com/question/14285697
#SPJ13
Two-digit natural numbers are formed, with replacement, from the digits 0 through 9.
How many numbers are greater than 64?
Answers
There are 35 natural numbers that are greater than 64.
Natural numbers:
Natural number are the numbers that start from 1 and end at infinity. In other words, they are counting numbers and they do not include 0 or any negative values.
Given,
Two-digit natural numbers are formed, with replacement, from the digits 0 through 9.
Here we need to find the numbers that satisfied the given condition and that is also greater than 64.
We know that, two digit natural numbers range from 10 to 99.
Since there are replacement take place, then each number formed from 10 to 99 is valid in this exercise.
Now, we have to move on to the other thing that is, those number are greater than 64,
Then we have to calculate it as,
=> 99-64 = 35 are greater than 64.
And those number are 65,66,67,68,69,...,98,99.
Finally, we have identified that there are 35 number are greater than 64.
To know more about Natural number here.
https://brainly.com/question/17429689
#SPJ1
What is the mean absolute deviation of 10,4,12,4,2,10,10,6
Answers
3.25 is the mean absolute deviation of 10,4,12,4,2,10,10,6
What is Mean absolute Deviation?Mean absolute deviation (MAD) of a data set is the average distance between each data value and the mean. Mean absolute deviation is a way to describe variation in a data set.
Given data:
10,4,12,4,2,10,10,6
Using the formula
Mean Absolute deviation = ∑(xi - x)/n
Mean = (10+ 4+ 12 +4+ 2+ 10 + 10+6)/8
= 58 / 8
= 7.25
Now,
10-7.25 = 2.75
4-7.25= -3.25
12-7.25=4.75
4-7.25=-3.25
2-7.25=-5.25
10-7.25=2.75
10-7.25=2.75
6-7.25=-1.25
mean absolute deviation=(2.75+3.25+4.75+3.25+5.25+2.75+2.75+1.25)/8
=26/8
=3.25
Hence 3.25 is the mean absolute deviation of 10,4,12,4,2,10,10,6.
Learn more about Mean absolute deviation here:
brainly.com/question/10528201
#SPJ1
Which of the following graphs represents the reflection of the point ( -3, 5) over the x-axis? I have to send you the other 2. It’s 4 altogether.
Answers
We have to identify the graph that represents the reflection of the point (-3,5) over the x-axis.
A reflection over the x-axis can be defined by the following rule: if we have a point (x,y), the image point after the reflection will have the same x-coordinate but the opposite of the y-coordinate.
It can be expressed as:
[tex]P=(x,y)\longrightarrow P^{\prime}=(x,-y)[/tex]Then, the image point for (-3,5) will be:
[tex](-3,5)\longrightarrow(-3,-5)[/tex]Then, this can be represented in a graph as:
This matches the following graph:
I need to find the inequality 5-12x<29
Answers
Answer:
Isolate the variable by dividing each side by factors that don't contain the variable.
Inequality Form:
x > −2
Interval Notation:
(−2, ∞)
X is greater than -2
Write an phrase that would translate into the following mathematical expression: 8z- 2 ?
Answers
The mathematical expression 8z - 2 can be phrased as:
The difference between 8 times the variable z and 2.
Mathematical expressions consist of at least two numbers or variables, at least one arithmetic operation, and a statement. It's possible to multiply, divide, add, or subtract with this mathematical operation.
Any mathematical object has a symbol, and that symbol is called a variable. A variable can specifically represent a number, a vector, a matrix, a function, its argument, a set, or one of its elements.
Consider the mathematical expression,
8z - 2
The expression can be defined as 2 less than the product of 8 and variable z.
The expression can also be rephrased as:
The difference between 8 times the variable z and 2.
Learn more about expression here:
brainly.com/question/1859113
#SPJ9
A delivery truck is transporting boxes of two sizes: large and small. The large boxes weigh 40 pounds each, and the small boxes weigh 25 pounds each. There are 135 boxes in all. If the truck is carrying a total of 4350 pounds in boxes, how many of each type of box is it carrying?
Number of large boxes:
Number of small boxes:
Answers
Number of large boxes will be 65.
Number of small boxes will be 70.
What is mathematical expression?
Expression in math is defined as the collection of the numbers, variables and functions by using operations like addition, subtraction, multiplication, and division.
Given that;
The large boxes weigh 40 pounds each, and the small boxes weigh 25 pounds each.
There are 135 boxes in all.
If the truck is carrying a total of 4350 pounds in boxes.
Let number of large boxes = x
Number of small boxes = y
Since, There are 135 boxes in all.
So, We get;
x + y = 135 ... (i)
And, The large boxes weigh 40 pounds each, and the small boxes weigh 25 pounds each and the truck is carrying a total of 4350 pounds in boxes.
So, we can formulate;
40x + 25y = 4350 ... (ii)
Solve equation (i) and (ii) as;
Multiply 40 by (i) and subtract by (ii) we get;
40x + 40y - 40x - 25y = 5,400 - 4,350
15y = 1,050
y = 70
And, x + y = 135
x + 70 = 135
x = 135 - 70
x = 65
Thus, Number of large boxes will be 65.
Number of small boxes will be 70.
Learn more about the mathematical expression visit:
https://brainly.com/question/723406
#SPJ1
what is the least common multiple of 62 and 31?
Answers
Answer:
there is none so it would be 62
Step-by-step explanation:
Bismuth-210 has a half-life of about 6 days. After 21 days, how many milligrams of a1,220 mg sample will remain? Round answer to the nearest tenth place. If answerdoes not have tenths place use a zero so that it does.
Answers
SOLUTION:
Step 1:
In this question, we are given the following:
Bismuth-210 has a half-life of about 6 days.
After 21 days, how many milligrams of a 1,220 mg sample will remain?
Round answer to the nearest tenth place.
Step 2:
The details of the solution are as follows:
[tex]\begin{gathered} We\text{ have that:} \\ 0.5\text{ = e}^{-6k} \\ Taking\text{ In of both sides, we have that:} \\ ln\text{ 0.5 = -6k} \\ That\text{ means that:} \\ k\text{ =}\frac{-ln\text{ 0. 5}}{6} \end{gathered}[/tex][tex]Let\text{ the number to remain, A=1220e}^{-(-\frac{ln0.5}{6})(21)}[/tex][tex]\begin{gathered} 107.83378\text{ mg} \\ \approx\text{ 107. 8 mg \lparen to the nearest tenth\rparen} \end{gathered}[/tex]CONCLUSION:
The final answer is:
[tex]107.\text{ 8 mg \lparen to the nearest tenth\rparen}[/tex]