Answer I need help this question because I don’t know what it is and I need help

Answer:

the answer is -14

Step-by-step explanation:

3x - 2y

3(2)-2(10)

6-20

6+-20

-14

The value of 3x - 2y when x = 2 and y = 10 is -14

Step-by-step explanation:

270,000

The ten-thousandths place is the fifth digit to the left of the decimal point, which is a 7 in this case.

The next number to the right of the 7 is a 4, which is 4 or less, so you don't need to round up the 7.  This means we can just replace the 4 and everything to the right of it with 0s.

If the 4 were 5 or more instead, you would turn the 7 into an 8 and then turn everything after it into 0s.

Step-by-step explanation:

let w be the cost of a bottle of water and p be the cost of a bag of pretzels

"2 bottles of water and 3 bags of pretzels is $7.05" can be written as

2w + 3p = 7.05    ------------- eq.1

"The cost of a bag of pretzels is $1.35" can be written as

p = 1.35 ------------- eq 2

Together, eq 1 and eq 2 make up your system of equations

To solve, take eq 2 and substitute this value int eq 1

2w + 3 (1.35) = 7.05

2w + 4.05 = 7.05

2w = 7.05 - 4.05

2w = 3

w = 1.5

Hence the cost of a bottle of water is $1.50

Answer: the cost of one bottle of water is $1.5 and the cost of one bag of pretzels is $1.35.

Step-by-step explanation: Let's call "b" the cost of a bottle of water and "p" the cost of a bag of pretzels, in the first equation of the system, we need to express the total prize of 2 bottles of water and 3 bags of pretzels, so it would be:

2b+3p=$7.05

The second equation will express the cost of a bag of pretzels:

p=$1.35

Now, to solve the system we replace the second equation into the first one:

2b+3($1.35)=$7.05

2b=$7.05-$4.05

2b=$3

b=$1.5

So the cost of one bottle of water is $1.5 and the cost of one bag of pretzels is $1.35.

Answer:

4309

Step-by-step explanation:

initial 8000

1st year 8000(1-.06)=8000(.94)

2nd year 8000(.94)^2

...

10 year 8000(.94)^10 approx 4309

Answer:

D. -5x² - 25x - 3

Step-by-step explanation:

Simply distribute where needed, evaluate the distribution, then combine like-terms to arrive at your answer.

The required solution of the given algebraic expression is -5x² − 25x + 3.

Given that,
The simplest form of the expression 2x(x − 6) − 7x² − (13x − 3) is to be determined.

The process in mathematics to operate and interpret the function to make the function or expression simple or more understandable is called simplifying and the process is called simplification.

Here,
Simplify the given expression,
= 2x(x − 6) − 7x² − (13x −3)
= 2x² -12x - 7x² -13x + 3
Associate the alike terms,
= -5x² -25x + 3

Thus, the required solution of the given algebraic expression is -5x² − 25x + 3.

Learn more about simplification here:

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By factorising a function, you can find the value of x-intercepts by substituting f(x)=0

By plotting a graph, you can check the values of x-intercepts

A function graph can be used to verify if a function is factored correctly by comparing the x-intercepts on the graph to the solutions of the factored function.

A function graph can be used to help verify that a function is factored correctly by examining its x-intercepts. When a function is factored correctly, the x-intercepts represent the values of x for which the function equals zero. In other words, they are the solutions to the equation f(x) = 0. By plotting the function and identifying the x-intercepts on the graph, we can compare them to the solutions of the factored function to determine if they match.

For example, let's say we have a function f(x) = (x+2)(x-3). The factored form suggests that the x-intercepts should occur at x = -2 and x = 3. By graphing the function and observing where it crosses the x-axis, we can confirm if these values are indeed the x-intercepts.

If the x-intercepts on the graph match the solutions of the factored function, it indicates that the function is correctly factored. However, if they do not match, it suggests an error in the factoring process.

Answer:

Straight edge, and compass.

Step-by-step explanation:

Greeks used very simple tools for geometric construction. They did not used advanced tools that we are using today.

Please mark brainliest and have a great day!

Answer:

The Greeks did not use ruler and tracing paper.

Step-by-step explanation:

Compass and straight edge were the tools that were used by Greeks in their formal geometric construction.

During earlier Greek times, simple geometric tools were used like compass and straight edge to draw something. Rulers and other tools came to use much later in time.

In a normal distribution, 99.7% of the data falls within three standard deviations from the mean. Given the mean of 68 and standard deviation of 4, 99.7% of the heights would range from 56 to 80 inches. Therefore, the answer is option A.

The question is about the normal distribution, a key concept in statistics. In a normal distribution, about 68% of the values fall within one standard deviation around the mean, 95% fall within two standard deviations, and 99.7% fall within three standard deviations. Since the mean height of the population is 68 inches and the standard deviation is 4 inches, three standard deviations from the mean would be 12 inches above and below the mean. Hence, 99.7% of the population's height would fall within the range of 68 inches - 12 = 56 inches and 68 inches + 12 = 80 inches.

So, the correct answer to this question is option A: 56 inches to 80 inches.

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The range within which 99.7% of the population will have a height can be found using z-scores. The correct answer is option A. 56 inches to 80 inches

To find the range within which 99.7% of the population will have a height, we need to use the concept of z-scores.

The range is usually defined as the mean plus or minus a certain number of standard deviations.

In this case, 99.7% of the population would fall within three standard deviations of the mean.

So, the range would be 68 - (3 * 4) = 56 inches to 68 + (3 * 4) = 80 inches.

Therefore, the correct answer is A. 56 inches to 80 inches.

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Answer:

She should cut each diagonal piece 10 ft long.

Step-by-step explanation:

The bottom face of the box is a rectangle 8 ft by 6 ft.

A diagonal of a rectangle divides the rectangle into two congruent right triangles. With a right triangle you can use the Pythagorean theorem.

a = length of rectangle = leg of right triangle

b = width of rectangle = other leg of right triangle

c = diagonal of rectangle = hypotenuse of right triangle

a^2 + b^2 = c^2

(8 ft)^2 + (6 ft)^2 = c^2

64 ft^2 + 36 ft^2 = c^2

c^2 = 100 ft^2

Take the square root of each side.

c = 10 ft

Answer: She should cut each diagonal piece 10 ft long.

Answer:

The diagonal piece of wood should be 10 feet long.

Step-by-step explanation:

The diagonal piece of wood will form a right-angled triangle with the width and length  of the box. By the Pythagoras Theorem:

x^2 = 6^2 + 8^2   where x is the  length of the diagonal.

x^2 = 36 + 64

x^2 = 100

x = 10 feet.

ANSWER

[tex](4 + 9i)(7 - 4i) = 64 + 47i [/tex]

EXPLANATION

The given complex number expression is:

[tex](4 + 9i)(7 - 4i)[/tex]

We expand using the distributive property to get;

[tex](4 + 9i)(7 - 4i) = 4(7 - 4i) + 9i(7 - 4i)[/tex]

[tex](4 + 9i)(7 - 4i) = 28- 16i + 63i - 36 {i}^{2} [/tex]

Recall that,

[tex] {i}^{2} = - 1[/tex]

Our expression now simplifies to:

[tex](4 + 9i)(7 - 4i) = 28 + 47i + 36 [/tex]

[tex](4 + 9i)(7 - 4i) = 64 + 47i [/tex]

Answer: [tex]64+47i[/tex]

Step-by-step explanation:

Given the Complex numbers multiplication:

[tex](4+9i)(7-4i)[/tex]

You need to follow these steps:

1. Apply Distributive property:

[tex](4+9i)(7-4i)=(4)(7)+(4)(-4i)+(9i)(7)+(9i)(-4i)=28-16i+63i-36i^2[/tex]

2. You need to remember that:

[tex]i=\sqrt{-1}\\\\i^2=-1[/tex]

Then, you need to substitute [tex]i^2=-1[/tex]:

 [tex]28-16i+63i-36(-1)=28-16i+63i+36[/tex]

3. Finally, add the like terms:

[tex]64+47i[/tex]

Answer:

The positive difference between the a values is 0.5

Step-by-step explanation:

we know that

Both parabolas cross the x axis at (-4,0) and (6,0)

so

The general equation is

[tex]y=a(x+4)(x-6)[/tex]

Find the value of a in the first parabola

The y-intercept is (0,-12)

so

For [tex]x=0, y=-12[/tex]

substitute

[tex]y=a(x+4)(x-6)[/tex]

[tex]-12=a(0+4)(0-6)[/tex]

[tex]-12=a(-24)[/tex]

[tex]a=0.5[/tex]

Find the value of a in the second parabola

The y-intercept is (0,-24)

so

For [tex]x=0, y=-24[/tex]

substitute

[tex]y=a(x+4)(x-6)[/tex]

[tex]-24=a(0+4)(0-6)[/tex]

[tex]-24=a(-24)[/tex]

[tex]a=1[/tex]

Find the positive difference between the a values for the two functions

so

[tex]1-0.5=0.5[/tex]

0.5

Step-by-step explanation:

[tex]\bf \cfrac{18x^4+27x^3-36x^2}{9x^2}\implies \stackrel{\textit{distributing the denominator}}{\cfrac{18x^4}{9x^2}+\cfrac{27x^3}{9x^2}-\cfrac{36x^2}{9x^2}} \\\\\\ \cfrac{18x^4x^{-2}}{9}+\cfrac{27x^3x^{-2}}{9}-\cfrac{36x^2x^{-2}}{9}\implies \cfrac{18x^{4-2}}{9}+\cfrac{27x^{3-2}}{9}-\cfrac{36x^2x^{-2}}{9} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill 2x^2+3x-4~\hfill[/tex]

Answer:

Part 1) The expression is [tex]24n[/tex]

Part 2) The value is [tex]115.2[/tex]

Step-by-step explanation:

Part 1) Find the expression

Let

n -----> the number

we know that

The algebraic expression of the phrase "The product of 24 and a number"  is equal to multiply the number by 24

so

[tex]24n[/tex]

Part 2) Find the value of the product when n=4.8  

substitute the value of n in the algebraic expression

[tex]24(4.8)=115.2[/tex]

Answer: It's C i got it right on edge

Step-by-step explanation:

Answer:

The solution is the point (-12,8)

Step-by-step explanation:

we have

-x-y=4 ----> equation A

x+2y=4 ----> equation B

Adds equation A and equation B and solve for y

-x-y=4

x+2y=4

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

-y+2y=4+4

y=8

Find the value of x

x+2y=4

x+2(8)=4

x=4-16

x=-12

therefore

The solution is the point (-12,8)

The quadratic formula is:

[tex]ax^{2} + bx + c = 0[/tex]

This means that

3 is a

-5 is b (this would be negative 5 not positive because it is being subtracted in the equation)

5 is c

This would make letter B correct!

Hope this helped!

~Just a girl in love with Shawn Mendes

Answer:

Events D and C are mutually exclusive.

Step-by-step explanation:

Two events D and C are mutually exclusive if

[tex]Pr(D\cup C)=Pr(D)+Pr(C)[/tex]

Find these probabilities. In a standard deck of 52 playing cards there are 13 diamond cards and 13 club cards.

The probabilty of chosing diamond is

[tex]Pr(D)=\dfrac{13}{52}=\dfrac{1}{4}[/tex]

The probabilty of chosing club is

[tex]Pr(C)=\dfrac{13}{52}=\dfrac{1}{4}[/tex]

The probabilty of chosing diamond or club is

[tex]Pr(D\cup C)=\dfrac{13+13}{52}=\dfrac{1}{2}[/tex]

Since

[tex]\dfrac{1}{2}=\dfrac{1}{4}+\dfrac{1}{4},[/tex]

events D and C are mutually exclusive.

Final answer:

In the context of a standard deck of 52 playing cards, the events representing diamonds (D) and clubs (C) are mutually exclusive events because a single card cannot be both a diamond and a club at the same time.

Explanation:

The question asks about the concept of mutually exclusive events in probability, using the context of a standard deck of playing cards. In a standard deck, there are four suits: spades, hearts, diamonds, and clubs. Diamonds (D) and clubs (C) are two different suits of cards, and so they are mutually exclusive events because the same card cannot be both a diamond and a club at the same time.

In reference to a standard deck of 52 cards which contains clubs, diamonds, hearts, and spades, each suit has 13 cards - A (ace), 2 through 10, J (jack), Q (queen), and K (king). Therefore, seeing as how a card from a deck cannot belong to two different suits, D and C are mutually exclusive events; there is no overlap between these two groups of cards.

Answer:

55

Step-by-step explanation:

Assuming she deposited the same amount each month.

Total ÷ Months = Amount Deposited Each Month

1,320 ÷ 24 = 55

Answer:

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Step-by-step explanation:

Answer: OPTION C.

Step-by-step explanation:

Given the expression [tex]\frac{4x^4y^3}{-8x^2y }[/tex] you  need to remember a property called "Quotient of powers property". This property states the following:

[tex]\frac{a^m}{a^n}=a^{(m-n)}[/tex]

Therefore, in order to reduce the given expression to lowest terms, it is necessary to apply this property. Once you apply it, you get:

[tex]\frac{4x^4y^3}{-8x^2y}=-\frac{x^{(4-2)}y^{(3-1)}}{2}=-\frac{1}{2}x^{2}y^{2}[/tex]

Answer:

2  2/3

Step-by-step explanation:

I'm going to change it to a multiplication problem by flipping the fraction after the division sign: 4/6  *    12/3

I'm going to reduce the fractions:  2/3   *  4

I'm going to write 4 as 4/1           : 2/3   * 4/1

Multiply straight across on top and straight across on bottom:   8/3

How many times does 3 go into 8:    2

The remainder of that is 2

So 8/3 can be written as    2  2/3  which really just means 2+2/3

Answer:

[tex] 2 \frac{2}{3} [/tex]

Step-by-step explanation:

To divide by a fraction multiply by the reciprocal of that fraction (flip the fraction you are dividing by and multiply)

[tex] \frac{4}{6} \times \frac{12}{3} [/tex]

Reduce the fractions and multiply:

[tex] \frac{4}{1} \times \frac{2}{3} = \frac{4 \times 2}{1 \times 3} = \frac{8}{3} [/tex]

8/3 equals 2 2/3.

Hope this helps!

Answer:

A) 5/2 is greater than 3/2

Step-by-step explanation:

Konichiwa~! My name is Zalgo and I am here to be of assistance to you today. The answer to your question would be Answer Choice 1/A;5/2>3/2. The reason it is the 1st answer choice is because 5/2 turned into a decimal is 2.5, but 3/2 turned into a decimal is 1.5, so since 2.5 is greater than 1.5, that would be the evidence that the 1st answer choice is correct!

I hope that this helps! :3

"Stay Brainly and stay proud!" - Zalgo

(By the way, do mind marking me as Brainliest? I'd greatly appreciate it! Arigato~!)

Answer:

Sara is 4 ft tall

Step-by-step explanation:

Let

x ----> the height of Sarah

using proportion

[tex]\frac{50}{75}=\frac{x}{6} \\ \\x=6*50/75\\ \\x= 4\ ft[/tex]

Final answer:

Using the properties of similar triangles, the height of Sarah is found to be 4 feet tall, given the proportions between the building's height and shadow and Sarah's shadow.

Explanation:

The question requires us to use the properties of similar triangles to find the height of Sarah given that a building 50ft high casts a 75ft shadow and Sarah casts a 6ft shadow. Since the triangles are similar, their sides are in proportion.

To find Sarah's height, we can set up a proportion using the corresponding sides of the similar triangles:

Building's height / Building's shadow = Sarah's height / Sarah's shadow

50ft / 75ft = Sarah's height / 6ft

To solve for Sarah's height, we can cross-multiply and divide:

(50ft × 6ft) / 75ft = Sarah's height

300ft² / 75ft = 4ft

Therefore, Sarah is 4 feet tall.

ANSWER

b=11

EXPLANATION

The given quadratic equation is

[tex](2x - 1)(x + 6) = 0[/tex]

We expand to get:

[tex]2 {x}^{2} + 12x - x - 6 = 0[/tex]

We simplify further by combining the x terms.

[tex]2 {x}^{2} + 11x - 6 = 0[/tex]

This is the standard form.

Comparing to

[tex]a{x}^{2} + bx + c= 0[/tex]

We have b=11

Answer:

45

Step-by-step explanation:

Hope this helps!

Answer:

A. (2,7/2)

Step-by-step explanation:

The midpoint formula is (x1+x2/2 , y1+y2/2).

So just plug the numbers into that formula and you get the answer.

Answer:

x-axis only.

Step-by-step explanation:

2x = 5y2 - 3

Convert to vertex form:

x = 5/2 y^2 - 3/2

This is a parabola  with axis of symmetry  y = 0. The vertex is at (-3/2, 0) and it opens to the right.

The axis of symmetry is the x-axis ( y = 0).

The equation 2x = 5y2 - 3 is only symmetric with respect to the x-axis but not the y-axis or the origin.

To test an equation for symmetry with respect to the x-axis, you would replace 'y' with '-y' and see if the equation remains the same. For symmetry with respect to the y-axis, you'd replace 'x' with '-x'. For origin symmetry, you would replace 'x' with '-x' and 'y' with '-y'

Applying this to your equation, 2x = 5y2 - 3:

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Answer:

Step-by-step explanation:

1. f(x) < 0

Interval of the domain where the graph is below the x-axis

because the negative regions of a function compromises those intervals where the function lies below the x-axis

2. x-intercept

Location on graph where output is zero

because when we find x-intercept we put y=0

3. y-intercept

Location on graph where input is zero

because when we find y-intercept we put x=0

4. f(x) > 0

Interval of the domain where the graph is above the x-axis

because the positive regions of a function compromises those intervals where the function lies above the x-axis

Perimeter=120

ED=x (length)

FE=4x (breadth)

Perimeter of rectangle= 2(l+b)

Given,

2(x+4x)=120

2x+8x=120

10x=120

x=120÷10

x=12

Therefore, value of x is 12

Answer: 12

Step-by-step explanation:

You are given that perimeter = 120, length (FE) = 4x, and width (ED) = x

 P  =    2L  + 2w    (P = perimeter, L = length, w = width)

120 = 2(4x) + 2(x)

120 =   8x   +  2x

120 =       10x

÷10       ÷10    

12  =          x

Check the picture below.