Annabel sent 39 text messages to her brother during the last 13 days. How many text messages did she send her brother each day if she sent him the same number of text messages each day?

nobody wants to help you .

The area οf the red band is 1766.3 [tex]cm^2[/tex].

Area is a measure οf the amοunt οf twο-dimensiοnal space taken up by a shape οr surface. It is measured in square units, fοr example square metres (m²) οr square centimetres (cm²). Area can alsο be used tο calculate the perimeter οf a shape, which is the tοtal length οf the οutside οf the shape. Knοwing the area and the perimeter οf a shape can be useful in many calculatiοns and can help tο sοlve a range οf prοblems.

The area οf the target can be calculated with the equatiοn

=>A = [tex]\pi r^2[/tex].

ln this case, the radius (r) is 30.0 cm, so

=> A = [tex]\pi30^2[/tex] = 1766.3 [tex]cm^2[/tex].

The area οf the entire target is 1766.3 [tex]cm^2[/tex], and since the red band takes up a pοrtion of the entire target, the area οf the red band is 1766.3  [tex]cm^2[/tex]

To know mοre about area refer the below link

https://brainly.com/question/28012687

#SPJ1

The radical expressions' exponents should match, or you should be able to modify the expressions to make the exponents match.

A radical is a symbol used in mathematics to symbolise the root of a number or mathematical expression. The square root, denoted by the sign, is the most prevalent variety of radical. The result of multiplying the square root of a number by itself is the initial value. For instance, 3 is the square root of 9, as 3 3 Equals 9. Additional values for radicals include cube roots, fourth roots, and so forth. A value that, when raised to the power of n, yields the initial number is known as the nth root of a number.

given

You usually need an equation with a single radical expression or multiple radical expressions that can be combined into a single expression when solving with radical exponents.

The radical expressions' exponents should match, or you should be able to modify the expressions to make the exponents match.

As soon as you have one radical expression, you can separate the radical word and then raise both sides of the equation to the proper power to get rid of the radical.

The resulting solution for the variable can then be solved.

To know more about radicals visit:

https://brainly.com/question/11707044

#SPJ1

Answer:

Step-by-step explanation:

The answer is 11.61

False, for both statements.

For the first statement, let A be an n x n matrix. If for two vectors y and z of Rⁿ we have Ay = Az, it does not necessarily mean that y=z. It is possible that A is a singular matrix, meaning that it does not have an inverse. In this case, there could be multiple vectors that would give the same result when multiplied by A. Therefore, it is not always true that y=z.

For the second statement, if A is a matrix of size n x n such that A³ = Iⁿ (where Iⁿ is the identity matrix of size n), it does not necessarily mean that A is invertible. It is possible for a matrix to have a power that equals the identity matrix, but not have an inverse. For example, consider the matrix A = [[0,1],[0,0]]. A² = [[0,0],[0,0]], and A³ = [[0,0],[0,0]], which is equal to I². However, A does not have an inverse, as its determinant is 0. Therefore, it is not always true that A is invertible if A³ = Iⁿ.

Learn more about matrix in this link: https://brainly.com/question/28180105

#SPJ11

a. The variables are x (number of adult tickets sold) and y (number of children's tickets sold).

b. The system of equations are x + y = 140 and 20x + 10y = 2270.

What is an equation?

A mathematical definition of an equation is a claim that two expressions are equal when they are joined by the equals sign ("=").

a. Variables are defined as -

Let x be the number of adult tickets sold.

Let y be the number of children's tickets sold.

b. System of equations is obtained as -

The total number of tickets sold is 140 -

x + y = 140

The total revenue earned is $2270 -

20x + 10y = 2270

Therefore, the variables and system of equations is obtained.

To learn more about equation from the given link

https://brainly.com/question/28871326

#SPJ1

the expression for 5,364 in terms of x is 5x³ + 3x² + 6x + 4, where x = 10.

why it is and what is multiple?

a) The number 5,364 can be written as the sum of multiples of powers of 10 as follows:

5,364 = 5 × 1,000 + 3 × 100 + 6 × 10 + 4 × 1

= 5 × 10³ + 3 × 10² + 6 × 10¹ + 4 × 10⁰

(b) If x = 10, then we can write 5,364 as:

5,364 = 5 × 10³ + 3 × 10² + 6 × 10¹ + 4 × 10⁰

= 5x³ + 3x² + 6x + 4

Therefore, the expression for 5,364 in terms of x is 5x³ + 3x² + 6x + 4, where x = 10.

A multiple is a product of a given number and any other whole number. In other words, if a number 'a' can be expressed as the product of another number 'b' and a whole number 'c', then 'a' is a multiple of 'b'. For example, 10 is a multiple of 5 because 10 can be expressed as 5 multiplied by 2. Similarly, 15 is a multiple of 3 because 15 can be expressed as 3 multiplied by 5.

To know more about multiple related questions visit:
https://brainly.com/question/5992872

#SPJ1

To find out how much of each mixture Donny should combine to make 6 kg of a mixture of 33% almonds, we need to use a system of equations. Let x be the amount of the first mixture and y be the amount of the second mixture.

The first equation represents the total amount of the mixtures:

x + y = 6

The second equation represents the amount of almonds in the mixtures:

0.40x + 0.25y = 0.33(6)

Solving the system of equations, we get:

0.40x + 0.25y = 1.98

0.40x + 0.25(6 - x) = 1.98

0.40x + 1.50 - 0.25x = 1.98

0.15x = 0.48

x = 3.2

Substituting the value of x back into the first equation:

3.2 + y = 6

y = 2.8

So Donny should combine 3.2 kg of the first mixture and 2.8 kg of the second mixture to make 6 kg of a mixture of 33% almonds.

Know more about mixture here:

https://brainly.com/question/6358654

#SPJ11

The value οf x and y in the shape will be 18/5 mm and 15/2 mm respectively.

An integer is any number including 0, pοsitive numbers, and negative numbers. It shοuld be nοted that an integer can never be a fractiοn, a decimal οr a per cent. Sοme examples οf integers include 1, 3, 4, 8, 99, 108, -43, -556, etc.

Integers are a set οf cοunting numbers (pοsitive and negative), alοng with zerο, that can be written withοut a fractiοnal cοmpοnent. As mentiοned abοve, an integer can be either pοsitive, negative οr zerο.

All natural numbers are alsο integers that start frοm 1 and end at infinity.

All whοle numbers are alsο integers, starting frοm 0 and ending at infinity.

An integer is a whοle number withοut any fractiοn οr decimal part.

Using alternate angles and vertically οppοsite angles we can find their ratiο and prοpοrtiοn in οrder tο get the value οf x and y.

[tex]\frac{x}{9} =\frac{3}{y} =\frac{2}{5}[/tex]

x = 2(9)/5 = 18/5 mm

y = 3(5)/2 = 15/2 mm

Learn more about integers on:

https://brainly.com/question/929808

#SPJ1

We need to add 225 ml of water to the 90 ml of concentrate to make lemon squash.

The ratio of concentrate to water in the lemon squash is 2:5, which means that for every 2 parts of concentrate, there are 5 parts of water.

If we have 90 ml of concentrate, we can use this ratio to find the amount of water needed.

We can set up a proportion as follows:

2/5 = 90/x

Where x is the amount of water needed.

To solve for x, we can cross-multiply:

2x = 5 * 90

2x = 450

x = 225

Therefore, we need to add 225 ml of water to the 90 ml of concentrate to make lemon squash.

Learn more about cross-multiply here : brainly.com/question/3460550

#SPJ1

Answer:

B. (-2,2)

Step-by-step explanation:

The interval on which the temperature was over 100°F is (0.79, 1.26).

To find the interval on which the temperature was over 100°F, we need to solve the inequality T(t) > 100.
First, let's rearrange the equation to isolate t:
T(t) = [4t / (t²+1)] + 98.6 > 100
[4t / (t²+1)] > 1.4
4t > 1.4(t²+1)
0 > 1.4t² - 4t + 1.4
Now we can use the quadratic formula to find the values of t that make this inequality true:
t = [-(-4) ± √((-4)² - 4(1.4)(1.4))] / [2(1.4)]
t = (4 ± √(16 - 7.84)) / 2.8
t ≈ 1.26 or t ≈ 0.79
Therefore, the temperature was over 100°F between the interval (0.79, 1.26).

Learn more about inequality here: https://brainly.com/question/24372553.

#SPJ11

Answer:

There are 60 seconds in 1 minute, so in 5 1/2 minutes:

5 minutes x 60 seconds/minute = 300 seconds

1/2 minute x 60 seconds/minute = 30 seconds

Adding those together gives:

300 seconds + 30 seconds = 330 seconds

Therefore, there are 330 seconds in 5 1/2 minutes.

There are 330 seconds in 5 and 1/2 minutes. We find this by converting the minutes (both the whole and the half) into seconds and adding these amounts together.

To calculate the number of seconds in 5 and 1/2 minutes, we need to know the basic fact that 1 minute equals 60 seconds. With this, we can easily convert minutes to seconds by multiplying the number of minutes by 60.

First, let's convert the 5 whole minutes into seconds: 5 minutes x 60 seconds/minute = 300 seconds.

Next, let's convert the half minute: 1/2 minute x 60 seconds/minute = 30 seconds.

FInally, add these two amounts together: 300 seconds + 30 seconds = 330 seconds. Therefore, 5 and 1/2 minutes equals 330 seconds.

https://brainly.com/question/36044379

#SPJ2

The polygon with an interior angle

sum of 1080° is an octagon, or

polygon with 8 sides.

We are given that the interior angle

sum of our polygon is 1080°. We also

know that the sum of the interior

angle of any polygon with "n" sides is

given by the formula (n - 2) × 180°.

Therefore, to determine the number

of sides that our polygon has, we set

this formula equal to 1080°, and solve

for "n".

Divide both sides of the equation by

180°.

Add 2 to both sides of the equation.

We get that our polygon has 8 sides,

and the name of a polygon with 8 sides

is an octagon. Therefore, the polygon

that has an interior angle sum of 1080°

is an octagon, or an 8 sided polygon.

To prove that {f € C°([0,1]) ||. f()dx = 0} is a vector space, we need to verify the following properties:

Closure under addition: Let f,g be two functions in {f € C°([0,1]) ||. f()dx = 0}. Then, for any x € [0,1], we have:

(f+g)(x) = f(x) + g(x)

Now, we can calculate the integral of (f+g)(x) from 0 to 1 as follows:

∫0^1 (f+g)(x) dx = ∫0^1 f(x) dx + ∫0^1 g(x) dx

Since f and g are in the set {f € C°([0,1]) ||. f()dx = 0}, we know that ∫0^1 f(x) dx = 0 and ∫0^1 g(x) dx = 0. Therefore, we have:

∫0^1 (f+g)(x) dx = 0

This means that f+g is also in the set {f € C°([0,1]) ||. f()dx = 0}, and thus the set is closed under addition.

Closure under scalar multiplication: Let f be a function in {f € C°([0,1]) ||. f()dx = 0} and let r be a scalar. Then, for any x € [0,1], we have:

(rf)(x) = r*f(x)

Now, we can calculate the integral of (rf)(x) from 0 to 1 as follows:

∫0^1 (rf)(x) dx = r*∫0^1 f(x) dx

Since f is in the set {f € C°([0,1]) ||. f()dx = 0}, we know that ∫0^1 f(x) dx = 0. Therefore, we have:

∫0^1 (rf)(x) dx = 0

This means that rf is also in the set {f € C°([0,1]) ||. f()dx = 0}, and thus the set is closed under scalar multiplication.

Existence of zero vector: The zero vector is the function f(x) = 0 for all x € [0,1]. This function clearly satisfies the condition that ∫0^1 f(x) dx = 0, and thus it is in the set {f € C°([0,1]) ||. f()dx = 0}.

Existence of additive inverse: Let f be a function in {f € C°([0,1]) ||. f()dx = 0}. Then, the additive inverse of f is -f(x) for all x € [0,1]. This function clearly satisfies the condition that ∫0^1 -f(x) dx = -∫0^1 f(x) dx = 0, and thus it is also in the set {f € C°([0,1]) ||. f()dx = 0}.

Since all the four properties are satisfied, we can conclude that {f € C°([0,1]) ||. f()dx = 0} is a vector space under the usual addition and scalar multiplication of functions.

For more questions like functions visit the link below:

https://brainly.com/question/30329761

#SPJ11

The complete table is

Whose card Length Width Perimeter Area

Sanya          10 cm 8cm               36cm         80 cm²

The perimeter of a shape is the distance around its edges. For a rectangle, like Sanya's greeting card, the perimeter can be found by adding up the lengths of all four sides. In this case, we have:

Perimeter = 2 × Length + 2 × Width

Perimeter = 2 × 10 cm + 2 × 8 cm

Perimeter = 20 cm + 16 cm

Perimeter = 36 cm

So, the perimeter of Sanya's greeting card is 36 centimeters. This means that if you were to walk all the way around the edges of the card, you would cover a distance of 36 centimeters.

The area of a shape is the amount of space it takes up. For a rectangle, the area can be found by multiplying its length by its width. In this case, we have:

Area = Length × Width

Area = 10 cm × 8 cm

Area = 80 cm²

So, the area of Sanya's greeting card is 80 square centimeters. This means that if you were to cover the card completely with paint or ink, you would need 80 square centimeters of paint or ink.

To know more about perimeter here

https://brainly.com/question/6465134

#SPJ4

Complete Question:

Sanya made greeting cards. Complete the table for their cards:

Whose card Length Width Perimeter Area

Sanya          10 cm 8cm              

The expected net gain (or loss) for playing one game is -$3.125, which rounds to -$3.25. The correct answer is d. -$3.25.

I am a question answering bot and do not have personal experiences to share. However, I can help you find the expected net gain (or loss) for playing one game in this scenario.

First, let's calculate the probability of each possible outcome:
- Probability of winning: 1/8
- Probability of placing 2nd or 3rd: 2/8
- Probability of placing 4th through 8th: 5/8

Next, let's calculate the net gain (or loss) for each possible outcome:
- Net gain for winning: $125 - $25 = $100
- Net gain for placing 2nd or 3rd: $0 (since you receive your money back)
- Net gain for placing 4th through 8th: -$25 (since you lose your money)

Finally, let's use these probabilities and net gains to calculate the expected net gain (or loss) for playing one game:
Expected net gain = (Probability of winning) x (Net gain for winning) + (Probability of placing 2nd or 3rd) x (Net gain for placing 2nd or 3rd) + (Probability of placing 4th through 8th) x (Net gain for placing 4th through 8th)
= (1/8) x ($100) + (2/8) x ($0) + (5/8) x (-$25)
= $12.50 + $0 - $15.625
= -$3.125

Therefore, the expected net gain (or loss) for playing one game is -$3.125, which rounds to -$3.25. The correct answer is d. -$3.25.

Learn more about Net gain

brainly.com/question/29665256

#SPJ11

Answer:

50%

Step-by-step explanation:

percent change = (new number - old number)/(old number) × 100%

Here, the new number is 2.

The old number is 4.

percent change = (2 - 4)/(4) × 100%

percent change = -2/4 × 100%

percent change = -50%

Since the percent change is negative, it's a percent decrease.

The percent decrease is 50%.

Among Luc, Deborah, and Melanie, the ratio in which the profit was shared is 2:3:7.

Let us assume that the ratio in which the profit shared among the three partners is L:D:M,

We know that the total profit for the year is = R176496,

We also know that Luc received R29416 and

Melanie received R102956.

So, Deborah profit share is calculated as;

⇒ Deborah's share = Total profit - Luc's share - Melanie's share

⇒ Deborah's share = R176496 - R29416 - R102956

⇒ Deborah's share = R44124,

So, now we know that the ratio of the profit shared among the three partners is:

⇒ L:D:M = R29416 : R44124: R102956

To simplify this ratio, we can divide all the amounts by R14708,

We get,

⇒ L:D:M = 2:3:7

Therefore, the profit was shared in the ratio of 8:1:28 among Luc, Deborah, and Melanie.

Learn more about Ratio here

https://brainly.com/question/21690816

#SPJ4

The given question is incomplete, the complete question is

Three partners Luc, Deborah and Melanie, share the profits of a business. The profit for the year is R176496. If Luc receives R29416 and Melanie receives R102956, determine the ratio in which the profit was shared.

The solution of the given system is x = -5/2, y = 2, and z = 13/2.

To determine whether the given system is inconsistent, dependent, or neither, we need to solve the system using any of the methods, such as substitution or elimination.

The given system is:
4x + y + 4z = 4
5x - y + 3z = 5
x - 2y - z = 0

Let's use the elimination method to solve the system.

Multiply the first equation by 2 and subtract the second equation from it to eliminate the y variable.
8x + 2y + 8z = 8
5x - y + 3z = 5
-------------------
3x + 5z = 3

Multiply the third equation by 2 and subtract it from the second equation to eliminate the y variable.
5x - y + 3z = 5
2x - 4y - 2z = 0
-------------------
3x + y + 5z = 5

Subtract the equation obtained in step 1 from the equation obtained in step 2 to eliminate the x variable.
3x + y + 5z = 5
3x + 5z = 3
----------------
y = 2

Substitute the value of y in the third equation to find the value of z.
x - 2(2) - z = 0
x - 4 - z = 0
x + z = 4

Substitute the value of y in the second equation to find the value of x.
5x - (2) + 3z = 5
5x + 3z = 7

Substitute the value of x + z in the equation obtained in step 5.
5(4 - z) + 3z = 7
20 - 5z + 3z = 7
2z = 13
z = 13/2

Substitute the value of z in the equation obtained in step 4 to find the value of x.
x + (13/2) = 4
x = 4 - (13/2)
x = -5/2

Therefore, the solution of the given system is x = -5/2, y = 2, and z = 13/2. Since the system has a unique solution, it is neither inconsistent nor dependent. Hence, the given system is neither inconsistent, dependent, nor neither.

Learn more about  substitution

brainly.com/question/10423146

#SPJ11

Answer: 52.5

Step-by-step explanation: I used a calculator.

The value of (g + f) (-1) is -6. The solution has been obtained by using operations on functions.

What are operations on functions?

The operations on functions allow us to add, subtract, multiply, and divide functions with overlapping domains in a manner akin to how we operate on the terms of the functions.

We are given f(x) = 3x²  and g(x) = x - 8

f(-1) = 3(-1)²

f(-1) = 3

g(-1) = -1 - 8

g(-1) = -9

(g + f) (-1)

⇒(g + f) (-1) = g(-1) + f(-1)

⇒(g + f) (-1) = -9 + 3

⇒(g + f) (-1) = -6

Hence, the value of (g + f) (-1) is -6.

Learn more about the operations on functions from the given link:

https://brainly.com/question/30194232

#SPJ1

Answer:

32 meters

Step-by-step explanation:

[tex]\frac{8}{15}[/tex] = [tex]\frac{x}{60}[/tex]  Set up a proportion using corresponding sides

15 x 4 = 60

8 x 4 = 32

Helping in the name of Jesus.

a) The graphic that illustrates the shape of the distribution of the data is shown below:



b) The Central Limit Theorem states that the distribution of sample means will be approximately normal with a mean equal to the population mean and a standard deviation equal to the population standard deviation divided by the square root of the sample size. In this case, the sample mean is 56.4645 and the sample standard deviation is 14.6052. Therefore, the standard deviation of the sample mean is 14.6052/sqrt(11) = 4.4016. Using a z-score of 1.645 for a 90% confidence interval, the interval is (56.4645 - (1.645*4.4016), 56.4645 + (1.645*4.4016)) = (50.2155, 62.7135). One reservation about this estimate is that the sample size is small and the distribution of the data is not normal, so the Central Limit Theorem may not be accurate.

c) The empirical bootstrap distribution (EBD) for the mean using 200 resamples is shown below:



The shape of the EBD is approximately normal, which is expected according to the Central Limit Theorem.

d) The 90% bootstrap confidence interval for the mean can be found by taking the 5th and 95th percentiles of the EBD. The 5th percentile is 52.7455 and the 95th percentile is 60.4818, so the interval is (52.7455, 60.4818). This interval is slightly wider than the one in (b), which is expected because the bootstrap method takes into account the variability of the sample.

e) The empirical bootstrap distribution (EBD) for the median using 200 resamples is shown below:



The EBD for the median is not as smooth as the EBD for the mean, and there are several spikes in the distribution. This occurs because the median is a more discrete measure than the mean, so there are fewer possible values for the median in the resamples.

Learn more about   standard deviation

brainly.com/question/23907081

#SPJ11

If "n is the positive integer, then n is even if and only if 7n + 4 will be even" is true.

To prove that we need to show the two things:

If n is even, then 7n+4 will be even.

If 7n + 4 is even, then n will be even.

Proof: Suppose that n is even. Then they exists an integer k such that n =2k. We can substitute this expression for n into 7n + 4 to get:

7n + 4 = 7(2k) + 4 = 14k + 4

= 2(7k + 2)

Since 7k + 2 is also an integer, we can see that 7n + 4 is even, since it is equal to twice an integer.

Now suppose that 7n + 4 is even. Then there exists an integer m such that 7n + 4 = 2m. We will rearrange this equation to have:

7n = 2m - 4

= 2(m - 2)

Since m - 2 is also an integer, we can see that 7n is even, since it is equal to twice an integer. Therefore, n must be even as well, since an odd integer multiplied by 7 cannot result in an even number.

Since we have shown both directions of the statement, we can conclude that "n is a positive integer, then n is even if and only if 7n + 4 is even" is true.

To know more about positive integer here

https://brainly.com/question/26051073

#SPJ4

There is a unique x∈Hi​ such that f(x)=y. Explanation:

If f is a function, then for any partition (Fi​)i∈I​ of B, (f−1(Fi​))i∈I​ is a partition of S. This is because for any x∈S, there is a unique y∈B such that f(x)=y. Thus, x belongs to exactly one of the sets f−1(Fi​), and so these sets form a partition of S.Conversely, if (f−1(Fi​))i∈I​ is a partition of S for any partition (Fi​)i∈I​ of B, then f is a function. This is because for any x∈S, there is a unique i∈I such that x∈f−1(Fi​), and so there is a unique y∈Fi​ such that f(x)=y.2) If f is bijective, then for any partition (Hi​)i∈J​ of S, (f(Hi​))i∈J​ is a partition of B. This is because for any y∈B, there is a unique x∈S such that f(x)=y. Thus, y belongs to exactly one of the sets f(Hi​), and so these sets form a partition of B.Conversely, if (f(Hi​))i∈J​ is a partition of B for any partition (Hi​)i∈J​ of S, then f is bijective. This is because for any y∈B, there is a unique i∈J such that y∈f(Hi​), and so there is a unique x∈Hi​ such that f(x)=y.Explanation:

Learn more about unique x∈Hi

brainly.com/question/10468098

#SPJ11

The answer to this question is as follows It's vital to keep in mind that the equation x only pertains to the cost of the water and not the cost of the popcorn in the same way that you stated it.

A mathematical equation links two statements and utilises the equals sign (=) to indicate equality. In algebra, an equation is a mathematical assertion that proves the equality of two mathematical expressions. For instance, in the equation 3x + 5 = 14, the equal sign separates the numbers by a gap. A mathematical formula may be used to determine how the two sentences on either side of a letter relate to one another. The logo and the particular piece of software are usually identical. like, for instance, 2x - 4 = 2.  

To calculate Theodore's overall spending, use the following expression:

3x + 4.50

This is due to the fact that he also spent $4.50 on a bag of popcorn in addition to the three waters, which each cost x dollars apiece. His whole expenditure may be calculated by adding these two charges.

When we condense the formula 3x + 4.50, we get:

the 7.50x

It's vital to keep in mind that the x only pertains to the cost of the water and not the cost of the popcorn in the same way that you stated it.

To know more about equation visit:

https://brainly.com/question/649785

#SPJ1

The total cost price of the book in birr using the cost in USA and importing value is equal to  62.80 birr per copy.

Cost of book = 2.40 USD in USA.

Convert the cost of the book in USD to birr,

1 USD = 21 birr

⇒2.40 USD = 2.40 x 21 birr

⇒2.40 USD = 50.40 birr

⇒ Cost of the book in birr is equal to 50.40 birr.

Cost of importing a book = 12.40 birr per copy

Add the cost of importing the book,

Total cost price of the book, including importing is equal to,

= 50.40 birr + 12.40 birr

= 62.80 birr

Therefore, the cost price of the book in birr including the cost of importing is equal to 62.80 birr per copy.

Learn more about cost price here

brainly.com/question/17710675

#SPJ4