11. Find the solution of the following system of equations using substitution:
2x + 7y = 5
y = x + 2

Answer: 12 electoral college votes

Step-by-step explanation:

4*100%=

4*100/100=

400/100=4

4*300%=

4*300/100=

1200/100=12 votes

Answer:

The ratio is 8:1 and it is a rectangle so x is 56

If on the similar image the sides are the same the other image will be aswell

Hope thie helps!

If you have any other question feel free to ask!

Answer:

9

Step-by-step explanation:

Edge

The prime factors of 6912 are 2 and 3 and the cube root of 6912 is approximately 19.05 (rounded to 2 decimal places) .

Prime numbers are numbers which do not have any factors other than 1 and itself. For example 7 is a prime number, 37 is a prime number as the factors of 7 are 1 and 7 and the factors of 37 are 1 and 37.

Prime factorization of a number is given by writing all the prime factors of as number in multiplication form.

The prime factorization of 6912 gives:

6912 = 2 × 2 × 2 ×2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 3 = 2⁸ × 3³

Hence the prime factors of 6912 are 2 and 3.

The cube root of 6912 = 19.0488... ≈ 19.05 (rounded to 2 decimal places)

Therefore the cube root of 6912 is approximately 19.05 .

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Solution :-

As we know that,

Therefore ,

>> m = -2 - (-3) / -1 - (-8)

>> m = -2 + 3 / -1 + 8

>> m = 1 / 7

We have that the data are:

(x₁ = -8, y₁ = -3) and (x₂ = -1, y₂ = -2)

The slope is equal to the change in and with respect to change in X, or what rises when moving forward.

[tex]\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{m=\frac{Change \ in \ y}{Change \ in \ x} \ \longmapsto \ \ m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}} } \end{gathered}$}}[/tex]

The change in X is equal to the subtraction in the X coordinate (also called advance), and the change in and is equal to the subtraction in the coordinate and (also called elevation).

Introduce the values of x and y In the equation to find the slope.

[tex]\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{m=\frac{-2-(-3)}{-1-(-8) } } \end{gathered}$}}[/tex]

[tex]\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{m=\frac{1}{7} } \end{gathered}$}}}[/tex]

Answer:

its c

Step-by-step explanation:

The domain of the given function is; (0, 2)

The range of the given function is; (-2, 6)

We want to evaluate the function f(x) = 4x - 2 for x = 0, 1 and 2.

Step 1;

f(0) = 4(0) - 2

f(1) = 4(1) - 2

f(2) = 4(2) - 2

Step 2;

f(0) = 0 - 2 = -2

f(1) = 4 - 2 = 2

f(2) = 8 - 2 = 6

The domain is the set of all possible input values which is (0, 2)

The range is the set of all possible output values which is (-2, 6)

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The domain of the function y = 3 ln x is (0, ∞) .

The graph of the function y = 3ln x is given below .

Then , coordinate point (1, 0)

The logarithmic function y = log x has the domain x > 0 (or) (0, ∞).

This is a logarithmic function. An important property of logarithms is that the domain cannot be denied. The same is true for x=0, since the logarithm of negative numbers is undefined.

The image attached shows the graph of this function, there you can notice its domain restriction.

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The compound inequality that represents the set of real numbers that are between -4 and 5 inclusive is the option;

D: -4 ≤ n ≤ 5

A compound inequality comprises of a sentence that makes two inequality statements that are joined by either the word 'and' or 'or'.

Given that the inequality represents the set of all real numbers that are between -4 and 5, and -4 < 5, the required set of numbers is therefore of the form;

[tex] - 4 \: \leftrightarrow \: 5[/tex]

The expression of the required set of numbers as inequalities is therefore;

The compound inequality is therefore;

D: -4 ≤ n ≤ 5

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The percentage of observations which we expect to lie between 100 and 200 is 3.38%

Given, the mean is 150 and

standard deviation(sd) = 25

what percentage of observation lie between 100 and 200.

x + 1sd = 175

x - 1sd = 125

x + 2sd = 200

x - 2sd = 100

x + 3sd = 225

x - 3sd = 7

observation between 100 and 200 lie from x + 1sd

Therefore P(x) = (100-175)÷25

= -3

=3.38%

Hence the percentage of observations that lie between 100 and 200 is 3.38%

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Answer:20

Step-by-step explanation:

n x 40% =8

So n = 8 / 40%
n = 20

Using proportions, it is found that he needs 39.5 grams of protein each day.

A proportion is a fraction of a total amount, and the measures are related using a rule of three. Due to this, relations between variables, either direct(when both increase or both decrease) or inverse proportional(when one increases and the other decreases, or vice versa), can be built to find the desired measures in the problem, or equations to find these measures.

First we have to convert his weight to kg. Each lb has 0.453592 kg, hence his weight in kg is given by:

132 x 0.453592 = 59.87 kg.

Each day, he needs to consume 0.66 g for each kilogram in his body, hence the amount of protein that he needs to consume each day is given by:

0.66 x 59.87 = 39.5.

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For the relations (tables) from left to right we have:

1) Is not a function, because the input 5 is mapped into two different values.

2) Is not a function, because the input -1 is mapped into two different values.

3) It is a function.

4) It is a function (the input x = 7 appears twice, but both times is mapped into the same output).

A relation is an operation that maps elements from one set called the domain (set of the inputs) into elements of another set, called the range (set of the outputs).

Now, a relation is a function only if each element of the domain is mapped into only one element of the range. So, if you see the same input in a table two times (related to two different outputs) then that table does not represent a function.

Then, for the tables reading from left to right, we have:

1) Is not a function, because the input 5 is mapped into two different values.

2) Is not a function, because the input -1 is mapped into two different values.

3) It is a function.

4) It is a function (the input x = 7 appears twice, but both times is mapped into the same output).

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The value of the expression when t=4 is 16

It should be noted that from the information given, it was stated that Mathes purchases 4 tickets for his family.

Therefore, the value of the expression when t=4 will be:

C = 4t

C = 4(4)

C = 4 × 4.

C = 16

Therefore, the value of the expression when t=4 is 16.

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The Excel formulas to enter in cell B16 is = SUM(B12 : F12)

From the question, we can assume the following:

Using the sum function, we have:

Total = SUM(B12 : F12)

So, the formula to enter in cell B16 is:

= SUM(B12 : F12)

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The number of hours to operate the mines to minimize cost are Mine 1 hour = 26.5 hours and Mine 2 hour = 14.5 hours

The given parameters can be represented using the following table of values

                              Mine 1 (x)              Mine 2 (y)   Available

Regular grade          6                            18             420

Low grade               16                             8              480

Operating cost      20500                     10200

Time                        55                              36

From the table, we understand that we are to minimize cost

This means that:

Objective function: C = 20500x + 10200y

Subject to:

6x + 18y >= 420

16x + 8y >= 540

Next, we plot the constraints on a graph (see attachment)

From the graph, we have

(x, y) = (26.5, 14.5)

This means that

Mine 1 hour = 26.5 hours

Mine 2 hour = 14.5 hours

Hence, the number of hours to operate the mines to minimize cost are Mine 1 hour = 26.5 hours and Mine 2 hour = 14.5 hours

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2. The solution to the given system of equation is x = 1 and y = 6

3. The solution to the given system of equations is x = 1, y = 2

4. The simplified form of the expression is y²

5. The simplified form of the expression is 2

8. the subtraction of the polynomials yields -2x³ + 3x² + 9x - 11

9. The multiplication yields x² - 4x - 96

10. The factored form of the expression is (x + 6)(x- 6)

11. The solutions to the given quadratic equation are x = 5 and x = -6

From the question, we are to solve the given system of equations

The given system of equation is

y = 10 - 4x      --------- (1)

2x + 3y = 20  --------- (2)

Substitute equation (1) into equation (2)

2x + 3y = 20

2x + 3(10 -4x) = 20

2x + 30 - 12x = 20

2x - 12x = 20 - 30

-10x = -10

x = -10/-10

x = 1

Substitute the value of x into equation (1)

y = 10 - 4x

y = 10 - 4(1)

y = 10 - 4

y = 6

Hence, the solution to the given system of equation is x = 1 and y = 6

3.

From the question, we are to solve the system of equations using the elimination method

The given system of equations is

5x + 2y = 9

-5x + 4y = 3

Add the two equations

5x + 2y = 9

-5x + 4y = 3

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

0x + 6y = 12

6y = 12

y = 12/6

y = 2

Substitute the value of y into the first equation

5x + 2y = 9

5x + 2(2) = 9

5x + 4 = 9

5x = 9 - 4

5x = 5

x = 5/5

x = 1

Hence, the solution to the given system of equations is x = 1, y = 2

4. From the question, we are to simplify the expression

y⁻⁴(y³)²

First, multiply the exponents in (y³)²

(y³)² = y ³ ˣ ²

= y⁶

Thus,

The expression becomes y⁻⁴y⁶

Applying the multiplication law of indices

y⁻⁴y⁶ = y⁻⁴ ⁺ ⁶

= y²

Hence, the simplified form of the expression is y²

5.

From the question, we are to simplify

∛8

First, express 8 in exponent form

8 = 2³

Thus,

The expression becomes

∛2³

Applying one of the laws of indices,

∛2³ = (2³)¹/³

Multiplying the exponents, we get

2¹

= 2

8.

From the question, we are to subtract the polynomial

(3x² + 5x - 8) - (2x³  - 4x + 3)

Subtracting

(3x² + 5x - 8) - (2x³  - 4x + 3)

3x² + 5x - 8 -(2x³  - 4x + 3)

Open the parentheses by distributing negative

3x² + 5x - 8 -2x³  + 4x - 3

Collect like terms

-2x³ + 3x² + 5x + 4x - 8 - 3

Simplify

-2x³ + 3x² + 9x - 11

Hence, the subtraction of the polynomials yields -2x³ + 3x² + 9x - 11

9.

From the question we are to multiply

(x + 8)(x - 12)

Applying the distributive property

x(x -12) +8(x -12)

x² - 12x + 8x - 96

Simplifying

x² - 4x - 96

10.

From the question, we are to factor

x² - 36

This can be written as

x² - 6²

From the rule of difference of two squares, we have that

a² - b² = (a + b)(a - b)

Thus,

x² - 6² = (x + 6)(x- 6)

11.

From the question, we are to find the solutions for

x² - x - 30 = 0

Solve by factoring

x² - x - 30 = 0

x² + 6x - 5x - 30 = 0

x(x + 6) -5(x + 6) = 0

(x - 5)(x + 6)  = 0

∴ x - 5 = 0 and x + 6 = 0

x = 5 and x = -6

Hence, the solutions to the given quadratic equation are x = 5 and x = -6

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The domain of the given relation is: {x| x = –7, –6, 2, 3, 11}.

A domain can be defined as the set of all real numbers for which a particular function is defined. This ultimately implies that, a domain is the set of all possible input numerical values to a function and the domain of a graph comprises all the input numerical values which are shown on the x-axis.

Additionally, the horizontal extent of a graph represents all domain values and they are read and written from smaller to larger numerical values, and from the left of a graph to the right.

In this context, we can reasonably infer and logically deduce that the domain of the given relation include the following: {x| x = –7, –6, 2, 3, 11}.

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Answer:

A) y = 0.3x+24

B) 283.5 dollars

Step-by-step explanation:

A) To create an equation in slope-intercept form, we can start by using the numbers the problem gave us and represent them as coordinates. Generally, time is always our x-value.

(230,93)

(530,183)

Now that we have our two coordinates, we can plug them into the slope-intercept formula: y₂-y₁/x₂-x₁ to find our slope.

(183-93)/(530-230) = 0.3

Now that we have our slope, we can plug it into our equation.

y = 0.3x + b

To find our y-intercept, we can take either one of our 2 coordinates (x,y) and plug them into the equation to solve for b.

93 = 0.3(230) + b

93 = 69 + b

93 - 69 = b

b = 24

Now that we have found our y-intercept, we can plug it into b to complete the equation.

y = 0.3x +24

B) If 865 minutes are used, we can plug 865 into x in our equation to find the total cost.

0.3(865) + 24 = 283.5

The correct option is that;

C. Leon overpaid for his purchase by $2.60 if he paid $44.64.

The vendor, who is acting as the state's agent, collects the sales tax and remits it to the state on behalf of the final customer. The use tax, on the other hand, is self-assessed and paid by the final customer.

Given that;

Purchase fuel = 12 Gallons per $2.89 per gallons (including Tax)

2 Granola Bar for $1.59 per bar

1  apple for $0.89

2 bottles of vitamin water for $1.39

The sales Tax rate is 7.5%

Required to calculate the difference amount of Actual Paid and Actual Purchase =?

Fuel = 12 x 2.89 = $34.68 (including tax)

Granola Bar = 2 x 1.59 = $3.18

Apple = 1 x 0.89 = $0.89

Vitamin Water = 2 x 1.39 = $2.78

Total Purchase excluding fuel without tax is,

= $3.18 + $0.89 + $2.78

= $6.85.

Adding sale tax on  $6.85 at the rate of 7.5% = $7.36

Hence, Total Purchase including Tax is,

$7.36 + $34.68 = $42.04

Thus, there is a clear difference that Leon paid 2.60 more than his actual purchase. He paid $ 44.64 and his actual purchase is 42.04 the difference between that is $2.60.

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The interpretation of the value of the function, [tex]f(x) = \frac{1}{25} \times \left( \left |6 \cdot x \right | + 5 \cdot x \right)[/tex], when x = 30 is that by running up 30 steps, Jayden burns [tex] 13 \frac{1}{3} [/tex] calories.

The domain of the function is the set of all real numbers

The given function is presented as follows;

[tex]f(x) = \frac{1}{25} \times \left( \left |6 \cdot x \right | + 5 \cdot x \right)[/tex]

Where;

f(x) = The number of calories burnt

x = The number of steps Jayden runs

The value of x is negative while running down the stairs

Therefore;

[tex]f(30) = \frac{1}{25} \times \left( \left |6 \times 30 \right | + 5 \times 30 \right) = 13 \frac{1}{3} [/tex]

[tex]f(30) = 13 \frac{1}{3} [/tex]

The interpretation of the above function equation is that the amount of calories Jayden burns when she runs 30 steps up the stairs is [tex] 13 \frac{1}{3} [/tex]

Given that 6•x > 5•x, the function is always positive, and has a minimum value of zero, the function can take any value for x.

The domain of the function is therefore, -∞ ≤ x ≤ ∞, which is the set of all real numbers.

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Answer:

B

Step-by-step explanation:

the British thermal unit (BTU or Btu) is a unit of heat; it is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

and it is outdated. your teacher and the manufacturer should use joules as metric.

1 BTU ≈ 1055 joules

anyway, so, the solution has several parts.

we need to find how many pounds of water are in a gallon.

and then multiply by the amount of gallons (20 000) and the amount of degrees (2 from 70 to 72).

and after a little search on the internet we get

1 gallon of water = 8.34 pounds

so, we need to warm

20000×8.34 pounds of water by 2 degrees F.

that is

20000 × 8.34 × 2 = 333,600 BTU

if we use only the rounded value of pounds per gallons (8.3), this would be

20000 × 8.3 × 2 = 332,000 BTU

so in any case, B is the right answer (as being the closest to the real result), which is the situation with any size classification of devices : reality is somewhere close by, but never meets the exact specifications.

The percent of distance that the Andersons will not travel by car is 12.5%, If they are planning to take a 960-mile trip and they will travel 840 miles by car.

Total distance the Andersons are planning to take is 960-mile

They will travel 840 miles by car

Distance they will not travel by car = total distance - distance travelled by car

= 960 - 840 miles

=120 miles

Percentage formula = (value/ total value) x 100

percent of the distance will they not travel by car =

         (total distance - distance travelled by car) x 100/total distance

=((960 - 840)/ 960) x100

=(120/ 960) x 100

12.5

If the Andersons are planning to take a 960-mile trip and they will travel 840 miles by car then ​the percentage of distance they will not travel by car is 12.5%

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Answer:

[tex]\sqrt{x^2+2}\left(x^2+x+2\right)^2[/tex]

Step-by-step explanation:

Given equation:

[tex](x^2+2)^{\frac{5}{2}}+2x(x^2+2)^{\frac{3}{2}}+x^2\sqrt{x^2+2}[/tex]

[tex]\textsf{Rewrite the exponents }\frac{5}{2} \textsf{ as } \left(\frac{1}{2} \cdot 5\right)\textsf{ and }\frac{3}{2} \textsf{ as }\left(\frac{1}{2} \cdot 3\right):[/tex]

[tex]\implies (x^2+2)^{\frac{1}{2} \cdot 5}+2x(x^2+2)^{\frac{1}{2}\cdot 3}+x^2\sqrt{x^2+2}[/tex]

[tex]\textsf{Apply exponent rule} \quad a^{bc}=(a^b)^c:[/tex]

[tex]\implies \left((x^2+2)^{\frac{1}{2}}\right)^5+2x\left((x^2+2)^{\frac{1}{2}}\right)^3+x^2\sqrt{x^2+2}[/tex]

[tex]\textsf{Apply exponent rule} \quad a^{\frac{1}{2}}=\sqrt{a}:[/tex]

[tex]\implies \left(\sqrt{x^2+2}\right)^5+2x\left(\sqrt{x^2+2}\right)^3+x^2\sqrt{x^2+2}[/tex]

Factor out [tex]\sqrt{x^2+2}[/tex] from each of the three terms:

[tex]\implies \sqrt{x^2+2}\left[\left(\sqrt{x^2+2}\right)^4+2x\left(\sqrt{x^2+2}\right)^2+x^2\right][/tex]

[tex]\textsf{Factor the expression in the parentheses using} \quad a^2+2ab+b^2=(a+b)^2.[/tex]

[tex]\textsf{Let }a=\left(\sqrt{x^2+2}\right)^2 \textsf {and }b=x:[/tex]

[tex]\implies \sqrt{x^2+2}\left(\left(\sqrt{x^2+2}\right)^2+x\right)^2[/tex]

[tex]\textsf{Apply exponent rule} \quad \sqrt{a^2}=a:[/tex]

[tex]\implies \sqrt{x^2+2}\left(x^2+2+x\right)^2[/tex]

[tex]\implies \sqrt{x^2+2}\left(x^2+x+2\right)^2[/tex]

The greatest common multiple of 60 and 72 is 6.

The given numbers are 60 and 72.

The greatest common factor (GCF) is a term used to describe the biggest number that can divide evenly into two or more numbers. Sometimes, this is also referred to as the greatest common divisor (GCD) or highest common factor (HCF). A factor is a smaller number that can divide evenly into that number.

Now, 60 = 2×2×3×5 and 72 = 2×2×2×3×3

The common factors are 2 and 3

So, the greatest common factor =2×3=6

Therefore, the greatest common multiple of 60 and 72 is 6.

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Answer:

QR = 11

Step-by-step explanation:

P-Q-R-S

PQ = RS

PS = 23

PR = 17

so RS = PS - PR = 23 - 17 = 6

RS = PQ = 6

QR = PS - (RS + PQ) = 23 - (6 + 6) = 23 - 12 = 11

Answer:

no solution

Step-by-step explanation:

Multiplying the second equation by 2 gives 2x-14y=38.

Adding this to the first equation, we get 0=9, and thus there is no solution.

Therefore the width of the rectangle is 33 yards

length of the rectangle is 196 yards.

Let the width of the rectangle be 'x'

Given the length of the rectangle = 35 yards less than 7 times the width

                                                          = 7x - 35

Given the area of rectangle = 6468 square yards

We know that area of rectangle = length * width

                                                       = (7x - 35 ) * x

By comparing both we get,

(7x - 35) * x = 6468

7x² - 35x - 6468 = 0

By dividing the equation by '7' we get

x² - 5x - 924 = 0

Factorize the above equation we get

x² - 33x + 28x - 924 = 0

x ( x - 33) +28 (x - 33 ) = 0

( x - 33 ) ( x + 28 ) = 0

∴ x = 33 , -28

Negative values are not consider

Therefore the width of the rectangle is 33 yards

length of the rectangle = 7(33) - 35

                                        = 231 - 35

                                        = 196 yards

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