20 points please help me out

Answer:

The solution to this system of equations is (-1, 1).

Step-by-step explanation:

A system of equations is a "a finite set of equations for which common solutions are sought". Or, they are a pair (or more) of equations that either intersect, are parallel, or the same line. For the sake of simplicity, we are going to focus on systems of equations that intersect and only have one solution.

A solution to a system of equations that intersect is represented by a point (x, y). This makes sense because at the intersection of two points, there lies a point.

So how do we find this point? We do this by solving the system of equations. We show that there exists a point in which two lines can be satisfied simultaneously. But how can we do that? Trial and error?! Well, no. There are some ways of approaching this.

The first method is graphing. By either using an external source or doing it yourself, graphing two lines and showing where they intersect is one of the more understandable ways of solving a system of equations. The point where they cross is the solution of the system.

The second method is elimination. This is observing that a system of equations can be combined together to eliminate a variable (x or y) and solving for the other in a one-variable equation. For example, say that I have this system of equations:

x - y = 1

x + y = 1

By simply adding the two together, I get:

2x = 2

x = 1.

Since we already have x = 1, we can substitute it back into one of the original equations to get y.

1 + y = 1

y = 0.

So, the solution to this system of equations would be (1, 0). Speaking of substituting ...

The third method is substitution. This is observing that a variable (x or y) can be written in terms of the other and then using that to substitute in and make one of the equations one-variable.

y = 2x + 3

x - y = -2

We can see that y is already in terms of x in the first equation, so let's substitute y for 2x + 3 in the second equation.

x - (2x + 3) = -2

- x - 3 = -2

- x = 1

x = -1

We can substitute x back into one of the original equations.

y = 2(-1) + 3

y = -2 + 3

y = 1

Therefore, the solution to this system of equations is (-1, 1).

Polynomials consist of both indeterminates and coefficients. The polynomial that is been represented by the algebra tiles is 2x²-4x -6.

A polynomial consists of both indeterminates and coefficients and involves mathematical operations such as addition, subtraction, multiplication, and division.

In order to find the polynomial that is been represented by the tiles, we will simply, calculate the number of tiles for each variable,

As we can see in the image,

Number of tiles labeled as x² = 2

Number of tiles labeled as -x = 4

Number of tiles labeled '-' = 6

therefore, the polynomial can be written as 2x²-4x -6.

Hence, the polynomial that is been represented by the algebra tiles is 2x²-4x -6.

Learn more about Polynomials:

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Answer:

A. 2x2 – 4x – 6

Step-by-step explanation:

Answer:

The pool manager pay for each item is $60.6.

Step-by-step explanation:

Given:

A pool manager balances the ph level of a pool.

The price of a bucket of chlorine tablets is $90, and the price of a ph test kit is $11.

The manager uses a coupon that applies a 40% discount to the total cost of the two items.

Now, to find the money the pool manager pay for each item.

The price of a bucket of  chlorine tablets is = $90.

The price of a ph test kit = $11.

So, to get the total price of both items we add both prices:

Total cost of two items = $101.

As, given a coupon that applies a 40% discount to the total cost of the two items.

Now, to get the total cost by applying discount:

Thus, the pool manager pay = $60.6.

Therefore, the pool manager pay for each item is $60.6.

Answer:

Step-by-step explanation:

Equivalent fractions obtained when the fraction is multiplied by a fraction with same numerator and denominator:

12 dollars is discounted off, making the price 28 dollars.

Step-by-step explanation:

10 percent is 4$, 4×3=12

The measure of the angle at which the poles meet at the top of the tepee is 180 degrees

Complementary angles are angles which sum is equals to 90 degrees. Two angles complement each other when there sum is 90 degrees.

The two poles meet at the top of the tepee.

The angle at which they meet is equals to twice the complement of the angles that the poles form with the ground. Therefore,

Complement of the angles that the poles form on the ground = 90°

Then the measure of the angle at which the poles meet at the top of the tepee is as follows:

Therefore, the measure of the angle at which the poles meet at the top of the tepee is 180 degrees

learn more on complementary angles: https://brainly.com/question/25783764

Answer:

a counter-clockwise 90 degree rotation about the origin

Step-by-step explanation:

Answer:

A reflection across the y-axis.

Step-by-step explanation:

I took the test :)

Answer:

A = 220 cm²

Step-by-step explanation:

Area of the rectangle = 11 x 18 = 198 cm²

Area of the triangle = 1/2 x (18 - 7) x (15 - 11) = 22 cm²

Therefore, area of the polygon = 198 + 22 = 220 cm²

Answer:

220 is The Correct Answer

Letter Choice (A)

Step-by-step explanation:

HERE'S MY PROOF AND MY RESEARCH

Area of a rectangle = width x height

Area of a triangle = 1/2 x base x height

Area of the rectangle = 11 x 18 = 198 cm²

Area of the triangle = 1/2 x (18 - 7) x (15 - 11) = 22 cm²

Therefore, area of the polygon = 198 + 22 = 220 cm²

Answer:

378 Lemons

Step-by-step explanation:

Because you use 2 lemons for every cup, you first need to find how many lemons per pitcher by multiplying 9 by 2 to get 18, so 18 lemons per pitcher, then multiply that by 21 because that's the total amount of pitchers to get 378 lemons

Answer:

Y=-2X

Step-by-step explanation:

The equation of the line that passes through points (0, 0) and (-4, 8) is

y = -2x.

Option F is the correct answer.

The equation of a line is given by:

y = mx + c

where m is the slope of the line and c is the y-intercept.

Example:

The slope of the line y = 2x + 3 is 2.

The slope of a line that passes through (1, 2) and (2, 3) is 1.

We have,

To find the equation of a line given two points, we can use the point-slope form of the equation of a line:

[tex]y - y_1 = m(x - x_1)[/tex]

where m is the slope of the line and (x_1, y_1) are the coordinates of one of the points on the line.

Given the coordinates (0, 0) and (-4, 8), we can find the slope of the line:

[tex]m = (y_2 - y_1) / (x_2 - x_1)[/tex]

= (8 - 0) / (-4 - 0)

= -2

Now that we have the slope of the line, we can choose one of the points to plug into the point-slope form.

Let's use (0, 0):

[tex]y - y_1 = m(x - x_1)\\y - 0 = -2(x - 0)\\y = -2x[/tex]

Therefore,

The equation of the line that passes through points (0, 0) and (-4, 8) is

y = -2x.

Learn more about equation of a line here:

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Step-by-step explanation:

take ∆PRT

angle prt = 30°(||sides, traversal, opp angles)

angle ptr = 45+y(|| sides, opp angles)

x+30+45+y = 180

x+y = 180-75= 105

x= 105-y

take triangle zrt

angle zrt =30(parallel sides and traversal with opp angles)

angle ztr = y(parallel lines)

30+y+w = 180

w = 150-y

angle pzt+azr = 360-300+2y=60+2y

pzt= 30+y

triangle pza

30+y + 45+30= 180

y = 180-105=75

w = 75

x=30

Answer:

C the 3rd one

Step-by-step explanation:

that's the best explanation for me. I'm sorry if I'm wrong I wish you luck

Answer:

1:30

Step-by-step explanation:

45 min = 15 min + 30 min

15 min before 2:15 is 2:00.

30 min before 2:00 is 1:30.

Answer:

The 7 is the answer dear 7 is greater

Answer:

7 of course.

Step-by-step explanation:

Anything negative will always be smaller then a non-negative. It's like having a friend younger then you that will never be older. Could i get brainliest :D

Answer:

x = 16 sin 38

Step-by-step explanation:

sin 38 = x/16

Multiply both sides by 16.

16 × sin 38 = x

x = 16 sin 38

Answer:

Step-by-step explanation:

Answer:

a = 2

Step-by-step explanation:

ax² + 5x + 2 = 0

a ( - 2 )² +5 ( - 2 ) + 2 = 0

4a = 8

a = 2

82+82*1.5=205

205+205*0.1=$225.50

Answer:

Step-by-step explanation:

Given equation:

Solve for variables:

Answers:

Answer:

3 cups

Step-by-step explanation:

[tex]36 : 24 = 4.5 : x[/tex]

where [tex]x[/tex] is the amount of flour he should use

Therefore,

[tex]\frac{36}{24} = \frac{4.5}{x}[/tex]

Cross multiply:  [tex]36x = 4.5 \times 24[/tex]

[tex]\implies 36x = 108[/tex]

Divide both sides by 36:  [tex]x = 108 \div 36 = 3[/tex]

Therefore, he should use 3 cups of flour

Answer:

[tex]r= 5in[/tex]

Step-by-step explanation:

[tex]\frac{500\pi }{3} =\frac{4}{3} \pi *r^{3} \\r^{3} =\frac{500}{3} *\frac{3}{4} \\r^{3}=125\\r= 5 in[/tex]

{ Bring the number into the equation }

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

Explanation:

Check out the diagrams below.

We'll start with the left diagram (marked "before") which is a right triangle with the horizontal leg of 25 feet and hypotenuse 65 feet.

Use the pythagorean theorem to find the vertical side x.

a^2 + b^2 = c^2

25^2 + x^2 = 65^2

625 + x^2 = 4225

x^2 = 4225 - 625

x^2 = 3600

x = sqrt(3600)

x = 60

The top of the ladder is 60 feet high when placed against the wall in this configuration.

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

If the upper end is moved down 8 feet, then x-8 = 60-8 = 52 feet is the new height of the ladder. Refer to the "after" in the diagram below.

Like earlier, we'll use the pythagorean theorem to find the missing side.

a^2 + b^2 = c^2

y^2 + 52^2 = 65^2

y^2 + 2704 = 4225

y^2 = 4225 - 2704

y^2 = 1521

y = sqrt(1521)

y = 39

The horizontal distance from the ladder base to the wall is now 39 feet.

Earlier it was 25 feet, so it has increased by 39-25 = 14 feet.

Answer:

551

Step-by-step explanation:

500+6(4)+3(1)(5+4)

500+24+3(9)

524+27

551

Brainliest is much appreciated

Answer:

515, just evaluated it

Answer:

Its personification they givin human characteristics to non human thangss

Answer: 58.84

Step-by-step explanation: If you use a calculator that's the nroken down part.

Answer:

8n

Step-by-step explanation:

The third side  of a triangle whose perimeter is 17n + 11 and the other two sides are (5n + 6) and (4n + 6) is 8n

[tex]6 \times 27 \times 28 \times 23 \times 3 = 312984[/tex]

Answer:

312984

Step-by-step explanation:

To solve the equation 6 x 27 x 28 x 23 x 3, you can follow these steps:

Start by multiplying the first two numbers: 6 x 27 = 162.

Then multiply the result by the next number: 162 x 28 = 4536.

Continue multiplying by the next number: 4536 x 23 = 104328.

Finally, multiply by the last number: 104328 x 3 = 312984.

The final result is 312984

Answer:

false

Step-by-step explanation:

the domain can be discrete or continuous