Suppose that you are given the following expression: -(-20). Which of the following is NOT equivalent to ?-(-20) A. 20 B.-20 C.[20} D.{-20} E.-(-(-(-20)))

The solution to the equation cos(x + 2π/3) = √2/2 over the interval

(0, 2π) is [7π/12, 3π/4]

A periodic function has a range that is determined for a fixed interval and a domain that includes all real number values.

Any function that has a positive real integer p such that f (x + p) = f (x), with all x being real values, is said to be periodic.

The given function is cos(x + 2π/3) = √2/2 over the interval (0, 2π).

(x + 2π/3) = cos⁻1(√2/2).

x + 2π/3 = π/4  or 21π/12   (As cos is +ve on I and IV)

Now,

x + 2π/3 = π/4.

x = π/4 - 2π/3.

x = (3π - 8π)/12.

x = - 5π/12.

x = π - 5π/12.

x = (12π - 5π)/12.

x = 7π/12.

And,

x + 2π/3 = 21π/12.

x = 21π/12 - 2π/2.

x = (21π - 12π)/12.

x = 9π/12.

x = 3π/4.

learn more about trigonometric functions here :

https://brainly.com/question/25618616

#SPJ1

The least possible number of coins in the treasure chest Jack found is 29.

In Mathematics, the Lowest Common Multiple (LCM) of any two or more natural numbers is the number that is the lowest of their common multiples.

For a minute put 1 coin aside from the collection.

Then, the number of remaining coins is a multiple of both 4 and 7.

So, the smallest such an integer number of coins

= 7 x 4

= 28.

Now, return 1 coins back.

= 28 + 1

= 29 coins.

Learn more about Least Common Multiple here:

https://brainly.com/question/30060162

#SPJ1

The exact area of the circle would be = 36πcm². That is option B.

The area of a circle can be calculated through the use of the formula = πr²

Where,

radius (r) = 6 cm

area = π × 6²

= 36π cm² ( in the terms of π)

Learn more about circle here:

https://brainly.com/question/26594685

#SPJ1

A high standard deviation indicates greater variability in the data set. A low standard deviation indicates lower variability in the data set.

A standard deviation is a measure of how spread out the values in a data set are. It is calculated by taking the square root of the variance, which is the average of the squared differences from the mean. A high standard deviation indicates that the values in the data set are far from the mean and spread out over a large range of values. This suggests that there is a large amount of variation and diversity in the data. On the other hand, a low standard deviation indicates that the values in the data set are close to the mean and spread out over a smaller range of values. This suggests that there is less variability and diversity in the data. A standard deviation of zero indicates that all values in the data set are the same. This suggests that there is no variation or diversity in the data. No one set of data is more accurate than another; accuracy depends on the context and purpose of the data. For example, if the goal is to identify trends or outliers, a data set with a high standard deviation may be more useful than one with a low standard deviation.

Learn more about standard deviation here

https://brainly.com/question/23907081

#SPJ4

Answer:

8/5

Step-by-step explanation:

divide numerator and denominator by 8 (GCF)

Answer:

8/5

Step-by-step explanation:

Divide into halves (3 steps):

[tex]\frac{64}{40} =\frac{32}{20} =\frac{16}{10} =\frac{8}{5}[/tex]

Or divide by eight (1 step):

[tex]\frac{64}{40} =\frac{8}{5}[/tex]

Hope this helps

A mathematical puzzle, where the rational numbers are used is attached with the answer.

A puzzle is a game, problem, or toy that tests a person's ingenuity or knowledge.

In a puzzle, the solver is expected to put pieces together in a logical way, in order to arrive at the correct or fun solution of the puzzle.

Given is to investigate a mathematical puzzle where rational numbers are used.

Refer to the image attached. It shows a mathematical puzzle attached where the rational numbers are used.

Therefore, a mathematical puzzle, where the rational numbers are used is attached with the answer.

To solve more questions on puzzles, visit the link below

https://brainly.com/question/12035060

#SPJ1

{Question in english -

Investigate a mathematical puzzle where rational numbers are used.}

The graph of the linear equation is attached

From the question, we have the following parametes that can be used in our computation:

A bowling alley charges $6 for shoe rental and $2 for each game.

This means that

Intial value = 6

Rate = 2

The function is then represented as

f(x) = Initial + Rate * x

So, we have

f(x) = 6 + 2x

See attachment fr the graph

Read more about linear function at

https://brainly.com/question/15602982

#SPJ1

Answer:

5.3

Step-by-step explanation:

sin24 = x/13

x = sin24(13) = 5.3

The markup is $6.47 and the selling price is $31.87

percentage, a relative value indicating hundredth parts of any quantity.

A markup is the amount added to the cost price of a product to determine the selling price.

Let the cost price of a box of copy paper is $25.4 and the markup is 25.4%

Now let us find the selling price by given formula.

Selling price = Cost price + (Cost price x Markup percentage)

Selling price = $25.4 + ($25.4 x 25.4%)

Selling price = $25.4 + ($25.4 x 0.254)

Selling price = $25.4 + $6.47

Selling price = $31.87

So, the markup is $6.47 and the selling price is $31.87.

Hence,  the markup is $6.47 and the selling price is $31.87

To learn more on Percentage click:

https://brainly.com/question/28269290

#SPJ1

Answer: midpoint is 4,5

Step-by-step explanation:

The exponential function is [tex]y = 1505.88(0.85)^x[/tex].

The monthly number of defective parts will be less than 500 about 7 months after Jane was hired.

What is an exponential function?

The formula for an exponential function is f(x) = a^x, where x is a variable and a is a constant that serves as the function's base and must be bigger than 0.

To model the monthly number of defective parts, we can use an exponential equation of the form:

[tex]y=a(b)^x[/tex]

Where y is the number of defective parts, x is the number of months after Jane was hired, a is the initial number of defective parts, and b is the common ratio between consecutive months.

To find the values of a and b, use the two data points given -

In the first month, there were 1,280 defective parts, which means that y = 1280 when x = 1.

In the second month, there were 1,088 defective parts, which means that y = 1088 when x = 2.

Substituting these values into the exponential equation -

1280 = a(b)

1088 = a(b)²

Dividing the second equation by the first equation -

1088/1280 = (a(b)²)/(a(b))

0.85 = b

Substituting b = 0.85 into the first equation -

1280 = a(0.85)

1280 = 0.85a

a = 1505.88 (rounded to two decimal places)

So the exponential equation that models the monthly number of defective parts is -

[tex]y = 1505.88(0.85)^x[/tex]

To find when the monthly number of defective parts will be less than 500, we can set y = 500 and solve for x -

[tex]500 = 1505.88(0.85)^x[/tex]

Dividing both sides by 1505.88 -

[tex]0.332 = (0.85)^x[/tex]

Taking the logarithm of both sides (with any base) -

log(0.332) = x log(0.85)

Dividing both sides by log(0.85) -

x = log(0.332) / log(0.85)

x ≈ 6.87

Therefore,  the monthly number of defective parts will be less than 500 about 7 months after Jane was hired.

To learn more about exponential function from the given link

brainly.com/question/12626186

#SPJ1

The numbers have been matched accordingly as below.

Rational numbers are numbers which can be written in the form of a/b, b ≠ 0, and a and b are integers.

Irrational numbers cannot be written in this form.

√30 is not a perfect square. So it is real, irrational root.

-26 is a negative real integer. So it is a real rational integer.

√64 is actually a perfect square root, 8, which is a whole number. So it is a real, rational root, whole number.

1/4 is of the form a/b. So it is also real, rational.

0.363363336.... is a real irrational decimal.

0.424242..... is a real rational decimal, since it is repeating in nature.

[tex]\sqrt{-7}[/tex] or [tex]7i[/tex] is an imaginary number.

Hence the numbers has been matched according to the properties.

Learn more about Rational and Irrational Numbers here :

https://brainly.com/question/17450097

#SPJ1

An expression which best represents the value of pi include the following: D. C/7.

Mathematically, the circumference of a circle can be calculated by using this mathematical expression:

C = 2πr or C = πD

Where:

Making π the subject of formula, we have the following:

π = C/D

Substituting the given parameters into the circumference of a circle formula, we have;

π = C/7.

Read more on a circle here: brainly.com/question/6615211

#SPJ1

Complete Question:

A circular pond has a circumference of about C feet. The diameter of the pond is 7 feet. Which expression best represents the value of pi?

A. C/14

B. 7/C

C. 14/C

D. C/7

As a result, the ratio of eighth students to seventh graders is 4:1.

A ratio is a comparison of two or more values, often expressed as a fraction or a colon-separated set of numbers. Ratios can be used to compare quantities of similar items, such as the ratio of the number of apples to the number of bananas in a basket. Ratios can also be used to describe the relationship between different aspects of a system, such as the ratio of length to width of a rectangle, or the ratio of time spent working to time spent sleeping. Ratios are a useful tool for making comparisons and understanding relationships between different values.

Here,

Out of the 15 students in the yearbook club, 3 are in 7th grade, and the rest are in 8th grade, which means there are 15 - 3 = 12 students in 8th grade.

The ratio of 8th graders to 7th graders can be calculated by dividing the number of 8th graders by the number of 7th graders:

12/3 = 4:1

So, the ratio of 8th graders to 7th graders is 4:1.

To know more about ratio,

https://brainly.com/question/29467965

#SPJ1

Answer: x = 18

Step-by-step explanation:

Rearrange the terms

70 = 7 + 3.5 × x

Calculate

-3.5x = 7 -70

Divide Both Sides

-3.5x = -63

x = [tex]\frac{-63}{-3.5}[/tex]

x = 18

A library has 2500 books.40% of the books are fiction, number of not fiction books are 1500.

A percentage is a relative figure that represents one tenth of a quantity. Since one percent (symbolised as 1%) is equal to one tenth of anything, 100 percent stands for everything, while 200 percent refers to double the amount specified.

Total amount of book in library are 2500 ,

Out of that 40% are fiction so the number of the non fiction books are 60%

so 60% of 2500 will give us the value of non fiction books,

Number of non fiction = 2500 x 60%

= 2500 x 60/100

= 25 x 60

= 1500

Therefore,  Number of non fiction books are 1500.

Learn more about Percentages problem:

https://brainly.com/question/29393986

#SPJ4

The probability that a student is in 4th grade given that they did not choose popular as the most important trait is 0.5 or 50%.

The probability is a concept used in statistics that measures the likelihood of an event occurring.

Let's call the event of a student being in 4th grade as A and the event of a student not choosing popular as the most important trait as B. We can find the probability of A and B happening together by dividing the number of students who are in 4th grade and did not choose popular by the total number of students. This can be represented as

P(A and B) = P(A | B) = (75 / 250) = 0.3.

Next, we can find the probability of B happening by dividing the number of students who did not choose popular by the total number of students. This can be represented as

P(B) = (150 / 250) = 0.6.

Finally, we can use Bayes' theorem to find the probability of A given B. Bayes' theorem states that

=> P(A | B) = P(A and B) / P(B).

Therefore,

=> P(A | B) = (75 / 250) / (150 / 250) = 0.3 / 0.6 = 0.5.

To know more about probability here.

https://brainly.com/question/11234923

#SPJ4

The number of possibilities are 20,160. Therefore, the option A is the correct answer.

Factorials is defined as the mathematical expression that is the product of the given number down to 1. It is denoted with the symbol n! which means that is n is given as 4, then it's factorial would be = 4×3×2×1 = 24.

Factorials is used in mathematics or statistics to denote the possibilities of an event in an outcome.

The number of specialty pizzas that is being offered by pizza parlor = 8

The number of specialty that Almeida's family wants to order = 2

To calculate the number of possibilities;

= 8!/2!

= 8×7×6×5×4×3×2×1/2×1

= 20,160.

Therefore, the option A is the correct answer.

Learn more about factorials here :

brainly.com/question/25997932

#SPJ1

The probability of being dealt two aces and one of them being the ace of spades is 1 in 221, or 0.45%.

The probability of being dealt two aces and one of them being the ace of spades is 1/221. This is because the chance of the first card being the ace of spades is 1/52 and the chance of the second card being an ace, given that the first card is an ace, is 3/51. Thus, the probability of both cards being aces and one of them being the ace of spades is 1/221.

Mathematically, this can be expressed as P(Ace of Spades, Ace) = P(Ace of Spades) x P(Ace|Ace of Spades) = (1/52) x (3/51) = 1/221.

This means that the probability of being dealt two aces and one of them being the ace of spades is 1 in 221, or 0.45%.

Learn more about probability  here:

https://brainly.com/question/11234923

#SPJ4

The equation of line that passes through (3,2) and has a slope of 1/3 in point-slope form is y - 2 = (1/3)( x - 2 ).

The point-slope formula is expressed as;

y - y₁ = m( x - x₁ )

Where x and y are the coordinates and m is the slope.

Given the data in the question;

Point (3,2)

Plug the values into the point-slope formula.

y - y₁ = m( x - x₁ )

y - 2 = (1/3)( x - 2 )

Therefore, the equation in point slope form is y - 2 = (1/3)( x - 2 ).

Learn more about equation of line here: brainly.com/question/2564656

#SPJ1

The elements in (D∩B)' is A,B,D.

A set is defined as collection of well-defined object. It is denoted by capital letters and their elements are denoted by small letters.

Given that ,

In venn diagram, B is the swamp portion and D is the rainforest portion.

C represents the intersection of B and D. i.e., C= (D∩B)

A is the universal set.

(D∩B)' = A - (D∩B)

          = A - C

Hence, (D∩B)' contains  A, B, D.

Learn more about sets here:

https://brainly.com/question/8053622

#SPJ1

Answer:

The value of [tex]r[/tex] is 24 cm.

Option C. 24 cm

Step-by-step explanation:

We can use the Pythagorean theorem to evaluate the missing side.

Here is the formula for the Pythagorean theorem.

[tex]a^2+b^2=c^2[/tex]

[tex]a[/tex] and [tex]b[/tex] are the legs of the triangle

[tex]c[/tex] is the hypotenuse

In this example we are given the value of 1 leg and the hypotenuse.

Knowing 2 of the 3 sides, we can evaluate the missing leg.

Let [tex]a=r[/tex]

We are given

[tex]b=10\\c=26[/tex]

Inserting our values into the Pythagorean theorem gives us

[tex]r^2+10^2=26^2[/tex]

Lets solve for [tex]r[/tex].

[tex]r^2+10^2=26^2[/tex]

Evaluate [tex]10^2[/tex].

[tex]r^2+100=26^2[/tex]

Evaluate [tex]26^2[/tex].

[tex]r^2+100=676[/tex]

Subtract [tex]100[/tex] from both sides of the equation.

[tex]r^2=576[/tex]

Take the square root of both sides to eliminate the exponent.

[tex]r=\sqrt{576}[/tex]

[tex]r=24[/tex]

Learn more about the Pythagorean theorem here

https://brainly.com/question/28981380

Step-by-step explanation:

I can explain what each item is, but I don't know exactly what it's asking

5 is a coefficient. The number attached to the left of the variable/term is always called the coefficient

x is the term/variable. Can always change the outcome, it just depends on the value inputed at that place

3 is a constant, since there's no term attached to it, it will always stay 3

Hope this helps in some way

Answer:

Amy is 14 years old and Sam is 10 years old.

Step-by-step explanation:

Let's represent Amy's current age as "A".

Since Sam is four years younger than Amy, his current age can be represented as (A - 4).

Five years ago, Amy's age was A - 5 and Sam's age was (A - 4) - 5 = A - 9.

At that time, Sam was half of Amy's age, so we can write the following equation:

(A - 9) = (A - 5) / 2

Expanding and simplifying the equation, we get:

A - 9 = 2A / 2 - 5 / 2

A - 9 = A - 5 / 2

7 = A / 2

A = 14

So, Amy is 14 years old and Sam is (14 - 4) = 10 years old.

a function means that for every input (value of x), there is only one output (value of y)

y can repeat, x cannot (unless it's with the same y value)

eg:

{(1,2), (1,3), (3,2)} is not a function because 1 has two outputs

but if it was

{(1,2), (2,3), (3,2)} it would be a function. It doesn't matter that 2 repeats in the y coordinate

lmk if you still have questions, I'm happy to help!

The y-intercept will be at (0, 22,995) and the x -intercept at (9, 0).

The y-axis is calibrated in dollars and the x-axis in years.

The graph is a straight line which starts  on the positive y axis and ends on the positive x-axis and has a negative slope .

Y - intercept:

The point of intersection is the point on the Y-axis through which the slope of the straight line passes. This is the y-coordinate of the point where the line or curve intersects the y-axis. This is shown when writing the equation for the y = mx + c straight line. where m is the slope and c is the intersection with the y-axis.

X- Intercept:

The x-intercept is the point at which the graph of the equation intersects the x-axis, and the y-value must be 0 for the point to intersect the x-axis. Consequently, the x segment can always be represented as (x, 0). The x value indicates where the graph intersects the x-axis.

According to the question:

When X = 0, y = 22995

And, X = 9  and Y = 0.

So the intercepts are (0,22995) and (9,0) which are shown on the right.

Learn more about Intercept:

https://brainly.com/question/14886566

#SPJ4

Answer:

On xy axis draw the line x+y=10  (slope -1; y-intercept 10)

Draw a vertical line at x=6

Draw a horizontal line y=7

The area will be all that above or on x+y=10, but on or below x=6 and y=7

The ribbon needs to be 25.12 inches.

The distance along a circle's perimeter is referred to as its circumference.

Given:

She is putting ribbon around a cake tray that has a diameter of 8 inches.

The diameter = 8 inches.

The circumference = 8 x 3.14

                                = 25.12 inches.

The ribbon needs to be 25.12 inches.

Hence, ribbon should be 25.12 inches.

To learn more about the circumference;

https://brainly.com/question/12512221

#SPJ1

The ratios of vegetarian and meat recipes to all recipes should be in Bradley’s cookbook is 75:50

A ratio is a comparison between two amounts that is calculated by dividing one amount by the other. The quotient a/b is referred to as the ratio between a and b if a and b are two values of the same kind and with the same units, such that b is not equal to 0. Ratios are represented by the colon symbol (:). As a result, the ratio a/b has no units and is represented by the notation a: b.

Given:

Total Recipes= 150

Books have three section: vegetarian dishes, meat dishes, and desserts.

So, vegetarians

= 150 x 1/2

= 75

and, Non vegetarians

= 150 x 1/3

= 50

Learn more about Ratio here:

https://brainly.com/question/13419413

#SPJ1