Someone Explain to me how 5. Is valid ???

16 just divide 64 by 4

Answer:

x = -6 and x=3

Step-by-step explanation:

We have been given the equation to solve

[tex](x-2)(x+9)=4x[/tex]

Let us simplify the left hand side of the equation using FOIL (first outer in last).

[tex]x^2+9x-2x-18=4x\\\\x^2+7x-18=4x\\\\x^2+3x-18=0[/tex]

Now, let us find the factors using AC method.

Middle term 3x can be written as 6x - 3x

[tex]x^2+3x-18=0\\\\x^2+6x-3x-18=0\\\\x(x+6)-3(x+6)=0\\\\(x+6)(x-3)=0\\\\x=-6,3[/tex]

Now, let us check the solution by plugging values in the original equation

For x= -6

[tex](-6-2)(-6+9)=4(-6)\\\\(-8)(3)=-24\\\\-24=-24\Rightarrow\text{ True}[/tex]

Thus, x=-6 is a solution.

For x= 3

[tex](3-2)(3+9)=4(3)\\\\(1)(12)=12\\\\12=12\Rightarrow\text{ True}[/tex]

Thus, x=3 is a solution.

Therefore, the solutions are x = -6 and x=3

Remark

Start with the product

Let the unknown number = x

The unknown number x is multiplied by 6

At this point you get 6x

====================================

Now you add 15

6x + 15 = 9

Solve

6x + 15 = 9      Subtract 15 from both sides.

6x = 9 - 15       Collect the terms on the right.

6x = - 6            Divide by 6

x = - 6/ 6

x = - 1

Answer:

Mary's Age = 12

Hector's Age = 2 x 12 - 5

                      = 24 - 5 = 19 years old

If the problem did not give you the percentile it would be confusing. You would not know if they wanted money or just a number!!! So it is pretty important.

We can figure this out by applying proportionality.

25/5 = 5.

We know the multiplier is 5 between the fraction on the right and the fraction on the left, so we need only to multiply 8 by 5.

8 * 5 = 40.

Your answer is C.

The number is 63 which is divided by -7 and the quotient is increased by 12, the result is 3.

When 'a' is divided by 'b', then the result we get from the division is the part of 'a' that each one of 'b' items will get. Division, thus, can be interpreted as equally dividing the number that is being divided into total x parts, where x is the number of parts the given number is divided.

We have been given that when a number is divided by -7 and the quotient is increased by 12 and the result is 3.

Let the number be x;

x ÷ -7

By hit and trial method, if we consider a number which is a multiplier of 7 and 3.

then it would be 63, now apply this number to the given condition.

63÷ -7 =  -9

Also, the quotient is increased by 12, the result is 3.

-9 + 12 = 3

Hence, the number is 63.

Learn more about division here:

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the 1st 10 prime numbers are ..wait let me look at my notes from 8th grade..oh found them here they are

2,3,5,7,11,13,17,19,23 and 29

hoped this helped:)

Greetings, the answer is 11.

Steps:

9+6=15

-4·15

-60

The correct answer is -60

The equation of a line formula is y=mx+b.

y = 1/4x - 2

m= 1/4

b= -2

Answer"

y=4x+-2

Step-by-step explanation:

Solving a system of linear equations involves finding the point where the two equations intersect when plotted on a graph. This can be done using a graphing calculator by first entering the equations into the calculator, then finding the point of intersection, which represents the solution.

To start solving the given system of linear equations: 2.1x+4.2y=14.7 and −5.7x−1.9y=−11.4, you first need to enter them into your graphing calculator. The intersection point of the two lines represented by these two equations will be your solution. If you don't see a clear intersection point, use the Intersection tool in your graphing calculator, which will provide the respective x and y coordinates of the intersection. This represents the solution to your set of equations.

For instance, if you have a calculator where you can plot both equations on the same graph, find the intersection point, the result is the solution of the system. If the graphing calculator finds an intersection at (x,y), that means x is the solution for the variable x and y is the solution for the variable y. This process is analogous to figuring out where the two lines would cross if you graphed them on a sheet of paper.

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To solve a system of linear equations using a graphing calculator, you first need to rewrite the equations in slope-intercept form: y = mx + b. Then input these equations into the graphing calculator. The intersection of the two graphs is the solution.

To solve the given system of linear equations—[tex]2.1x+4.2y=14.7[/tex]and [tex]-5.7x-1.9y=-11.4[/tex]—using a graphing calculator, you first have to rewrite the equations in slope-intercept form (y = mx + b), where 'm' represents the slope and 'b' represents the y-intercept.

To do this, isolate 'y' in both equations. For the first equation, you would do the following:

Repeat the same process with the other equation and you will have two equations with 'y' isolated. Input these two equations into your graphing calculator. Where the graphs intersect represents the solution to the system of equations, that is, the values of x and y that satisfy both equations.

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The estimated value can be given by 21.76

To solve this expression, let's just:

[tex]\\\large \sf 102.3 \div 4.7 = 21.7659574468\\[/tex]

We can make the approximation to the first two numbers after the point, thus having the result

[tex]\red{\boxed{\large \sf \approx 21.76}}[/tex]

So, the answer will be 21.76

Answer:

20

Step-by-step explanation:

I believe the answer is B, but I'm not 100% sure. :)

the answer is 5.

                                                hope it helps

3x - 5y = 6

-3x         -3x

      -5y = -3x + 6

       [tex]\frac{-5y}{-5} = \frac{-3x}{-5} + \frac{6}{-5}[/tex]

          [tex]y = \frac{3}{5}x - \frac{6}{5}[/tex]  ⇒  m = [tex]\frac{3}{5}[/tex]

perpendicular slope (m⊥) = [tex]-\frac{5}{3}[/tex]

Point-Slope equation:

m = [tex]-\frac{5}{3}[/tex]    (x₁ , y₁)= (-8, 0)

y - y₁ = m(x - x₁)

y - 0 = [tex]-\frac{5}{3}[/tex](x - (-8))

    y = [tex]-\frac{5}{3}[/tex](x + 8)

    y = [tex]-\frac{5}{3}x - \frac{40}{3}[/tex]

It is simple. There are 3 pizzas and 26.28 total. We are suppose to find for each pizza.

26.28/3=8.76

B. $8.76 per pizza

Answer

B. $8.76

I got it right and also if you multiply 8.76 by 3 you get 26.28 and the same goes for 26.28 divided by 3 which equals 8.76.

Respuesta: El noveno piso costara $16 millones

Solucion:

El primer piso costara $12 millones y cada piso sucesivamente al segundo $500,000 mas que el piso precedente.

Esta es una progresion aritmetica, porque cada valor se obtiene sumandole al valor anterior un valor constante que es la razon "r". En este caso la razon es:

r=$500,000

Que en millones de dolares es:

r=$0.5 millones

Tenemos el primer valor: El primer piso costara $12 millones:

a1=$12 millones

Y necesitamos el costo del noveno piso, o sea el noveno valor: a9=?

Tenemos esta formula para calcular el valor de un termino cualquiera "an" de una progresion aritmetica, conociento el  primer termino de la misma:

an=a1+(n-1)r

En este caso n=9, entonces sustituyendo en la formula anterior:

a9=a1+(9-1)r

a9=a1+8r

Reemplazando los valores dados en la formula de arriba:

a9=$12 millones+8($0.5 millones)

a9=$12 millones+$4 millones

a9=$16 millones

The mean [tex]\mu =11.5[/tex] pounds;

the standard deviation is [tex]\sigma =2.7[/tex] pounds.

Let the variable [tex]X[/tex] be the weight of male babies less than 2 months old. It is normally distibuted with a law

[tex]X\sim N(11.5, 2.7^2).[/tex]

Find the variable

[tex]Z=\dfrac{X-\mu}{\sigma},[/tex] that is normally distributed with a law

[tex]Z\sim N(0, 1).[/tex]

Part A.

If X=15 pounds, then

[tex]Z=\dfrac{15-11.5}{2.7}\approx 1.2963[/tex] and

[tex]Pr(X<15)=Pr(Z<1.2963)\approx 0.9032[/tex]

Part B.

If X=15 pounds, then

[tex]Z=\dfrac{15-11.5}{2.7}\approx 1.2963.[/tex]

If X=13 pounds, then

[tex]Z=\dfrac{13-11.5}{2.7}\approx 0.5555[/tex] and

[tex]Pr(13<X<15)=Pr(0.5555<Z<1.2963)\approx 0.9032-0.7123=0.1909[/tex]

Part C.

If X=17 pounds, then

[tex]Z=\dfrac{17-11.5}{2.7}\approx 2.0370[/tex] and

[tex]Pr(X>17)=Pr(Z>2.0370)=1-Pr(Z<2.0370)\approx 1-0.9793=0.0207.[/tex]

This means that approximately 2% of babies are born with weight more than 17 pounds and, therefore, seems to be quite unusual for a baby.

Using standard normal distribution properties, we calculate that about 90.32% of babies weigh less than 15 pounds, around 19.07% of babies weigh between 13 and 15 pounds and just 2.07% of babies weigh more than 17 pounds, which is considered unusual.

These questions are solved using the properties of the normal distribution. The standard score (or z-score) is calculated with the formula z = (x-μ)/σ where x is the value, μ is the mean, and σ is the standard deviation.

For babies that weigh less than 15 pounds: Z = (15-11.5)/2.7 = 1.30. You then use a standard normal table (also called a z-table) to find the proportion associated with this z-score, which is about 0.9032. Therefore, about 90.32% of babies weigh less than 15 pounds.

For babies that weigh between 13 and 15 pounds you need to find the z-scores for both weights and identify the difference. Therefore, for 13 pounds, z = (13-11.5)/2.7 = 0.56, and for 15 pounds z=1.30 as calculated before. The odds of a weight between the two is approximately 0.9032 - 0.7125 = 0.1907. So, about 19.07% of babies weigh between 13 and 15 pounds.

For a baby to weigh more than 17 pounds, you again calculate the z-score which results in z = (17-11.5)/2.7 = 2.04. The proportion associated with this z-score is about 0.9793 but since we want to find the proportion of babies weighing more than 17 pounds we do 1 - 0.9793 = 0.0207 meaning only about 2.07% of babies weigh over 17 pounds. This is well below 5%, so it is considered unusual.

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the answer is c) 0.375, a number that terminates.

Answer:

D- 0.375 with a repeating bar over 375., a number that repeats

Step-by-step explanation:

Convert 3 over 8 to a decimal and tell whether it terminates or repeats.

A- 3.8, a number that terminates

B- 3.8 with a repeating bar over 8., a number that repeats

C- 0.375, a number that terminates

D- 0.375 with a repeating bar over 375., a number that repeats

You can use the sin function to solve this.

Think of a triangle with the conveyor being the longest side (hypotenuse). The height (the vertical side) is H=17m. The angle of elevation is a=36.2. We are looking for length of the hypotenuse, L.

The sin is the ratio of height to hypotenuse: sin(36.2) = H/L = 17/L

Now solve for L:

L = 17/sin(36.2) = 17m/0.59 = 28.78m

The conveyor needs to be approx. 28.8m long to get close to the max. efficient angle.

The answer is y = 6 which is option B.

Solution for y:

4y + 13 = 37

= 4y = 37 - 13

= 4y = 24

= y = 24/4

= y = 6

y-intercept is -6 (0,-6) and the x-intercept is -3 (-3,0)

Solution

1. The algebraic expression =  -0.5n - 3.8, where n is the number of minutes.

2. Here the variable "n" represents the number of minutes.

Thank you.

For this case we have the following data:

In this way, the depth of the diver for a certain number of minutes is given by:

[tex]3.8 + 0.5x[/tex], where x represents the number of minutes

Answer:

Question 1: [tex]3.8 + 0.5x\\[/tex]

Question 2: x represents the number of minutes

The answer is 857011

Answer : The correct answer is, 857011

Step-by-step explanation :

We are given an expression :

A value that is [tex](879000-21989)[/tex]

The mathematical operation used in the expression is subtraction.

Calculating the value of given expression, we get:

[tex](879000-21989)=857011[/tex]

Hence, the value of the expression is 857011.

Your answer would be: A) 0

Letters' B, C, and D are all greater than or equal -3 when they substitute "X".

Hope this helps you :)

20 plus 10 equals 30.

A) 3y - x = 10 is the correct answer! (I just graphed it on Desmos.com)

Step-by-step explanation: usatestprep approved

Answer:

9.5

Step-by-step explanation:

The cost function for renting a limo for the prom is Cost(c) = 200 + 25c, where c is the number of passengers. The domain is {4, 6, 8, 10}, representing the possible number of passengers (4 to 10). A table of values for this domain shows the total costs at 300, 350, 400, and 450 respectively for groups of 4, 6, 8, and 10 passengers.

To calculate the cost of renting a limo for the prom including the cost of refreshments based on the number of passengers, we can define a function Cost(c) where c represents the number of passengers. The function can be written as:

Cost(c) = 200 + 25c

The domain of this function is the set of all possible numbers of passengers, which ranges from 4 to 10 (counting in groups of two, since each friend brings a date). Therefore, the domain is {4, 6, 8, 10}.

Next, we'll create a table of values with this domain to calculate the costs associated with each potential number of passengers:

(4, 300)

(6, 350)

(8, 400)

(10, 450)

Each ordered pair represents (number of passengers, total cost).