Solve the system of equations by the addition method.−2x−y=0 10x+y=−8​

[tex]\displaystyle\\Answer:\ (-\frac{3}{13},-2\frac{6}{13} )[/tex]

Step-by-step explanation:

[tex]\displaystyle\\\frac{3}{10} =0.3\\\\(-3,-5)\ \ \ \ \ (9,6)\\\\\boxed {x=\frac{x_1+\lambda x_2}{1+\lambda} }\ \ \ \ \ \ \ \ \ \ \ \boxed {y=\frac{y_1+\lambda y_2}{1+\lambda} }\\\\x_1=-3\ \ \ \ \ x_2=9\ \ \ \ \ y_1=-5\ \ \ \ \ \ \ y_2=6\\\\x=\frac{-3+0.3*9}{1+0.3} \\\\x=\frac{-3+2.7}{1.3} \\\\x=\frac{-0.3}{1.3}\\\\ x=-\frac{0.3*10}{1.3*10}\\\\ x=-\frac{3}{13} \\\\[/tex]

[tex]\displaystyle\\y=\frac{-5+0.3*6}{1+0.3} \\\\y=\frac{-5+1.8}{1.3} \\\\y=\frac{-3.2}{1.3} \\\\y=-\frac{3.2*10}{1.3*10} \\\\y=-\frac{32}{13} \\\\y=-2\frac{6}{13} \\[/tex]

Therefore, the ratio of the number of laptops to total computers is 2:7

Number of laptops repaired by a technician = 18

Number of desktops repaired by a technician = 24

Total number of computers = no of laptops + no of desktops

                                              = 18 + 24

                                              = 42

We have to determine the ratio of laptops to total computers as

= no of laptops / total no of computers

= 18 / 42

= 6 / 14

= 2 / 7

Therefore, the ratio of the number of laptops to total computers is 2:7

To learn more about linear systems refer below

https://brainly.com/question/3526238

#SPJ9

Answer:

75°

Step-by-step explanation:

[tex]m\angle KLM=m\angle KLQ+m\angle QLM \\ \\ 173=x+105+x+82 \\ \\ 173=2x+187 \\ \\ 2x=-14 \\ \\ x=-7 \\ \\ \implies m \angle QLM=-7+82=75^{\circ}[/tex]

Answer:

75

Step-by-step explanation:

Answer:

nwm zycze powodzenia kolego drogi

The line AB joining the points A and B on the plane M lies in plane M.

Say there are two points A and B which lies on the plane M.  

Through any two points, there is only one line. Then there is exactly one line joining the two points A and B which is the line AB

Since both the points lies on the plane M, the line joining them should also lie on the plane M.

The postulate which verifies this is:

If two points lie on a plane, then the line joining the points also lies on the same plane.

Learn more about Line postulates at https://brainly.com/question/17302331

#SPJ1

The area of the Triangle is 7.8 cm².

The perimeter of the triangle is given to be 13cm.

As we know,

perimeter of triangle = sum of length of all sides of the triangle.

13cm = 4cm + 5cm + third side

third side = 4cm.

Hence two side of the triangle are equal to 4cm. We can say that this is an isosceles triangle, with the base length as 5cm and the other two equal sides of length 4cm.

Let say the base length is B and the other sides length is A.

So area of the isosceles triangle can be given by,

Area = 1/2 x B x √(A²-B²/4)

Area = 1/2 x 5 x √(4²-5²/4)

Area = 1/2 x 5 x √(16 - 25/4)

Area = 1/2 x 5 x 3.12

Area = 7.8 cm².

The area of the triangle is 7.8cm².

To know more about Area of Isosceles Triangle, visit

https://brainly.com/question/16754556

#SPJ9

The required ratio of students to teachers is 19: 1.          

Given that,
The total enrollment of male students and female students is 15,363 male and 19,512 female respectively.
The total number of full-time instructional faculty was 1,849.
To determine the ratio of students to teachers.

Here,
Total students = 15363 + 19512 = 34875
Number of teachers = 1849
Now,
Ratio = total students / teacher
Ratio = 34875 / 1849
Ratio = 19 : 1

Thus, the required ratio of students to teachers is 19 : 1.

Learn more about ratios here:

brainly.com/question/13419413

#SPJ1

Value of (F/G)(-3)  with the given functions F(x)=x² -19 and G(x) = 14 - x is equal to (-10/17).

As given,

Given functions

F(x)=x² -19

G(x)=14 - x

Substitute the values in the required function:

( F/G )(x)=( x² -19 )/( 14 - x)

Now substitute x= -3

( F/G )( -3) =[ (-3)² -19 ] /[ 14 - (-3) ]

⇒ ( F/G )(-3) =( 9-19) / (14+ 3)

⇒ ( F/G )(-3) =( -10/17)

Therefore, value of (F/G)(-3)  with the given functions F(x) = x² -19 and G(x) = 14 - x is equal to (-10/17).

Learn more about functions here

brainly.com/question/12431044

#SPJ1

Answer:

Step-by-step explanation:

Solve parts of equation in order:

Brackets

Indices

Division

Multiplication

Addition

Subtraction

8 + 2 x 7 - 9 = 63

8 + (2 x 7) - 9  not = 63   (multiplication is the first thing that applies to this equation)

(8 + 14) - 9  not = 63

22 - 9 = 13

So the error would be it equals 13 not 63

Answer:

9 is supposed to be 7

Step-by-step explanation:

8 + 2 = 10

10 × 7 = 70

70 - 7 = 63

Answer:

x - 17.95 = 71.80

Use the commutative property of addition

71.80 + 17.95 = 89.75

$89.75 was the original price.

Step-by-step explanation:

Hope it helps! =D

considering the distance between the center of the circle and the chord is perpendicular, pythagorean theorem can be applied to calculate the radius of the circle.

[tex]r^2=a^2+b^2[/tex] , r=radius, a=half of the chord length, b the distance between the center of the circle and the center of the chord

[tex]r^2=(4.5cm)^2+(5cm)^2\\r^2=20.25cm^2+25cm^2\\r^2=45.25cm^2\\r=\sqrt{45.25cm^2}\\r=6.7268cm[/tex]

The vertical distance (Δ`y`) for the slope triangle as indicated is; (4-2) ; 2.

The horizontal distance (Δ`x`) for the slope triangle as indicated is; (4-0) ; 4.

According to the task content, it follows that the vertical and horizontal distance for the slope triangle in discuss are to be determined.

Hence, by observation, Δ`y` can be obtained on the graph from points 4 and 2; we have; 4-2 = 2.

Also, by observation, Δ`x` can be obtained on the graph from points 4 and 0; we have; 4-0 = 4.

Ultimately, the vertical and horizontal distances of the slope triangle are as indicated.

Read more on slope triangle on a graph;

https://brainly.com/question/24820338

#SPJ1

Answer:

D

Step-by-step explanation:

I got it right!

Answer:

d

Step-by-step explanation:

took the test

a. Because [tex]f[/tex] is even,

[tex]\displaystyle \int_{-7}^7 f(x) \, dx = 2 \int_0^7 f(x) \, dx = 18 \\\\ ~~~~ \implies \int_0^7 f(x) \, dx = \frac{18}2 = \boxed{9}[/tex]

b. The product of an even function [tex](f)[/tex] by an odd function [tex](x)[/tex] is an odd function, whose integral over a symmetric interval is zero.

[tex]\displaystyle \int_{-7}^7 xf(x) \, dx = \boxed{0}[/tex]

Step-by-step explanation:

1)

the perimeter P

P = 2x + 2y = 80 m

the area A

A = x × y

2)

2x + 2y = 80

2y = 80 - 2x

y = 40 - x

and we use that in the equation for area

A = x × (40 - x) = 40x - x²

we find the maximum (or minimum) of a function by finding the 0s of the first derivative.

A' = 40 - 2x = 0

40 = 2x

x = 20

y = 40 - x = 40 - 20 = 20

and just to be sure :

if the second derivative at that point x is negative, we have a maximum, if it is positive, we have a minimum.

A'' = -2

so, it is negative for all x incl. x = 20.

therefore, we have a maximum.

the rectangle with perimeter of 80 m and the max. area is a square of 20 m side length.

Answer:

The tip was 20.6% or 20.59% of the original bill

Step-by-step explanation:

Question: The bill for dinner was $77.12. You left $15.88 for the tip. What percentage of the original bill was the tip?

Step-by-step:

To find the percentage of how much a part ($15.88) is or a whole ($77.12), the formula of part = percentage * whole is used.

It is usually written as a = p*w

In this case, $15.88 is a and $77.12 is w.

so, 15.88 = p*77.12

However, we need to find p. To do so, we need to get p by itself. Divide 77.12 on both sides so that it cancels out on the right side.

15.88 divided by 77.12 is about 0.2059

We need to make the decimal a percentage by multiplying 100

0.2059 * 100 = 20.59%

You could probably round it up to 20.6% if you wanted to

Therefore, the tip was 20.6% or 20.59% of the original bill.

There are 56 milligrams in 8 milliliters of the drug if the drug's label says each milliliter contains 7 milligrams of the substance.

The ratio is defined as a relationship between two quantities, it is expressed as one divided by the other.

Let x milligrams would in 8 ​milliliters.

We can write this as a ratio as

As per the given information,

1 milliliter  : 7 milligrams  = 8 milliliter   : x milligrams

⇒ 1 / 7 = 8 / x

⇒ x = 8 × 7

⇒ x = 56 milligrams

Hence, there are 56 milligrams in 8 ​milliliters of the drug.

Learn more about the Ratio here:

brainly.com/question/1504221

#SPJ1

Answer: 3/7

The factors of 18 are 1,2,3,6,9,18;

The factors of 42 are 1,2,3,6,7,14,21,42.

Answer:

y = x/7 + 31/7

or 7y = x + 31

Step-by-step explanation:

The slopes of two perpendicular lines are negative reciprocals of each other so slope will be 1/7

m = 1/7, y = -4, x = 3

y = mx + b

-4 = 1/7(3) + b

b = 3/7 + 4

b = 3/7 + 28/7

b = 31/7

so

y = x/7 + 31/7

or 7y = x + 31

Answer: 3

Step-by-step explanation:

The required scale factor of the given dilation is 3. Option D is correct.

Given that,
The center of dilation is (2, 2).
To determine the scale factor of the dilation.0

The scale factor is defined as the ratio of modified change in length to the original length.

Here,
Length of one side of triangle former dilation = 2 units
Length of one side of triangle later dilation = 6 units
Scale factor = later dimensions / former dimensions = 6 / 2 = 3

Thus, the required scale factor of the given dilation is 3. Option D is correct.

Learn more about line Scale factors:

https://brainly.com/question/22312172

#SPJ1

Answer:

22.6796 kg.

Step-by-step explanation:

The answer is 22 i am sure about this

Step 1) : Based on the given conditions, formulate

[tex] \large\bf \longrightarrow \frac{510}{3000} [/tex]

Step 2) : Calculate

[tex] \bf \longrightarrow\frac{51 \cancel{0}}{{300 \cancel{0}} } \: = \frac{51 \div 3}{300 \div 3} = \frac{17}{100} [/tex]

Step 3) : Convert to percentage

[tex] \bf\longrightarrow{\frac{17}{100} = 0.17}[/tex]

The observational study is the Cross-sectional studies.

It should be noted that an observational study is simply used to answer a research question that is based on what the researcher observes.

This is a cross-sectional studies because it analyzes a population of study at a specific point in time. It should be noted that this involves narrowing previously collected data to one point in time to test the prevalence of a theory.

Learn more about observational study on:

https://brainly.com/question/549332

#SPJ1

Answer:

true

Step-by-step explanation:

Answer:— 36, 20-29 years, 20-29 years, Total confirmed cases in ages 20-29 over the 14 day period ... 707, 01/03/2022, 1151692, 36278, 18031.4286.

Step-by-step explanation:

The equation of the line tangent to the parabola at x = 4 is y = 13 · x - 27. The tangent line has a slope of 13 and a intercept of - 27.

Parabolae are defined by quadratic equations, that is, equations whose form is y = a · x² + b · x + c. The slope of a line tangent to a point of the curve is defined by a linear equation, that is, an equation of the form y = m · x + b. By derivative rules, the slope of the tangent line can be found by using the following expression:

m = 2 · a · x + b

Then, if we know that y = 2 · x² - 3 · x + 5 and x = 4, then the equation of the tangent line is:

Slope

m = 4 · x - 3

m = 4 · 4 - 3

m = 13

Intercept

b = y - m · x

y = 2 · 4² - 3 · 4 + 5

y = 32 - 12 + 5

y = 25

b = 25 - 13 · 4

b = 25 - 52

b = - 27

The equation of the line tangent to the parabola at x = 4 is y = 13 · x - 27. The tangent line has a slope of 13 and a intercept of - 27.

To learn more on tangent lines: https://brainly.com/question/27760700

#SPJ1

Answer:

95=Xx9 +Yx2.50

Step-by-step explanation:

The inequalities graphically shows the given situation is 95 ≥  +2.50y + 18x. The graph is attached below.

If the equation or inequality contains variable terms, then there might be some values of those variables for that equation or inequality might be true. Such values are called solution to that equation or inequality.

Here Set of such values is called solution set to the considered equation or inequality.

We have been given that William and his children went into a restaurant where they sell hamburgers for $8 each and drinks for $2.50 each.

Since William has $95 to spend and must buy no less than 18 hamburgers and drinks altogether.

If x represents the number of hamburgers purchased and y represents the number of drinks purchased then;

95 ≥  +2.50y + 18x

Learn more about inequalities here:

https://brainly.com/question/27425770

#SPJ2

A statement, rule, or regulation that establishes the relationship between an independent variable and a dependent variable is known as a function.

A network can be represented mathematically as a graph, which explains the connection between lines and points. A graph consists of some points with connecting lines.

Consider the function,

[tex]f(x)=\frac{||x||+2}{2}[/tex] and 0 ≤ x ≤ 6

To graph the function we will find the points on the graph for different values of x.

When x = 0,

[tex]f(x)=\frac{||x||+2}{2}[/tex]

[tex]f(x)=\frac{||0||+2}{2}=1[/tex]

When x = 1,

[tex]f(x)=\frac{||x||+2}{2}[/tex]

[tex]f(1)=\frac{||1||+2}{2}\\ f(1)=\frac{3}{2}[/tex]

When x = 2,

[tex]f(x)=\frac{||x||+2}{2}[/tex]

[tex]f(2)=\frac{||2||+2}{2}[/tex]

[tex]f(2)=2[/tex]

When x = 3,

[tex]f(x)=\frac{||x||+2}{2}[/tex]

[tex]f(3)=\frac{||3||+2}{2}[/tex]

[tex]f(3)=\frac{5}{2}[/tex]

When x = 4,

[tex]f(x)=\frac{||x||+2}{2}[/tex]

[tex]f(4)=\frac{||4||+2}{2}\\ f(4)=3[/tex]

When x = 5,

[tex]f(x)=\frac{||x||+2}{2}[/tex]

[tex]f(5)=\frac{||5||+2}{2}[/tex]

[tex]f(5)=\frac{7}{2}[/tex]

When x = 6,

[tex]f(x)=\frac{||x||+2}{2}[/tex]

[tex]f(6)=\frac{||6||+2}{2} \\f(6)=4[/tex]

Therefore, the points on the graph of the function [tex]f(x)=\frac{||x||+2}{2}[/tex] are ( 0, 1 ), ( 1, ( 3/2 ) ), ( 2, 2 ), ( 2, ( 5/2 ) ), ( 4, 3 ), ( 5, ( 7/2 ) ), and ( 6, 4).

Hence, the graph of the function is:

Learn more about function here:

https://brainly.com/question/11624077

#SPJ9