Mathematics High School

Bài 2: Tìm x biết


a, (x + 2)(x + 3) - (x - 2)(x + 5) = 6


b, 3(2x - 1)(3x - 1) - (2x - 3)(9x - 1) = 0

Answers

Answer 1

Answer:

76

Step-by-step explanation:

Related Questions

83% of408 ndjfjjfjfjfjfjfjfjfjfjfjfjfnfnnfndndnd

Answers

Answer:

338.64

Step-by-step explanation:

Multiply 408 by .83 and get 338.64.

Someone plz help me :(

Answers

Answer:

c

Step-by-step explanation:

How do you graph 2x+5

Answers

Answer:

Read explanation

Step-by-step explanation:

First you put a point on (0,5).  Then you perform rise/run which is the slope.  The slope is 2.  So from (0,5) you go up 2 and to the right one and make another point.  You then use a ruler and draw a line connecting them and put arrows at the end.  

I agree with them ^^^

There are 20 passengers in 10 cars. How many passengers per car?

Answers

Answer:

2 in each car. Simple.

Step-by-step explanation:

Answer: it’s two cause 20 divided by 10 is 2.

What linear function in form y=Mx+b for the line passing through (4.5,-4.25) with y-intercept 2.5

Answers

Answer:     y = −1.5x + 2.5 Step-by-step explanation:

       For us to write the equation for this line, we need to (1) find the slope of the line, and (2) use one of the points to write an equation:  

       The question gives us two points (one of which is the y-intercept), (4.5,-4.25), and (0, 2.5), from which we can find the slope and later the equation of the line.

 

Finding the Slope    

The slope of the line (m) = (y₂ - y₁) ÷ (x₂ - x₁)    

                                        =  (2.5 - (- 4.25)) ÷ (0 - 4.5)

                                        =  −1.5

                                   

 Finding the Equation

Now that we know the slope and the y-intercept, we can write the equation of the line in the point-slope form (y = mx + b)

                                            y = −1.5x + 2.5

Checking my answer:

I used Desmos to graph the line I got and the points. Since the line passes through the points then the line is correct.

Please help me find the answer.​

Answers

Answer: sqrt 91

Step-by-step explanation:

We can substitute in y here as 30, so that 60+102=2x^2

182=2x^2

In the order of operations, it states that exponents comes before multiplication

91=x^2

So x will be the square root of 91

The base of a triangle is 4x+6cm,the height is 5cm. What is the actual length of the base

Answers

is it 10cm long? 4 + 6 =10

The formula for the volume of a cone is shown below. V represents the volume, r radius and h height.

What is the height of a cone with a volume of 110 cubic cm and a base of 5 cm (so the radius is 2.5 cm)

V=1/3pir^2h

Answers

Answer:

110/5=2

2,5.5=15

2+15=17

Step-by-step explanation:

Find the measure of each marked angle.

Answers

Answer:

X= 15, m∠78°

Step-by-step explanation:

Since the angles are vertically opposite

Therefore their measurements are equal

Therefore (2x + 48 ) = (5x + 3 )

So,

[tex](2x + 48) = (5x + 3)\\(2x-5x)= (3-48)\\-3x = -45\\x = -45/-3\\x = 15[/tex]

[tex](2x + 48)\\=( 2* 15 + 48)\\= 30 + 48\\=78\\\\(5x + 3)\\=(5*15 + 3)\\=75+3\\=78[/tex]

They both equal 78°

Someone please help me out!!! ​

Answers

Answer:

a=54 b=57 AB=246. This is the best answer ever!!!

28=(6+x)(4+x)
Find x
X=0.38516 = -5+sqrt(24)
AB= 3.89897

solve the equation and check the solution 3x+2(x+2)=22-3(2x-5)​

Answers

Answer:

x=3

Step-by-step explanation:

It takes one Pizza to feed 4 people. If you invite 52 people, how many pizzas will you need?

Answers

Answer:

13.

Step-by-step explanation:

So, if you need to feed 52 people and each pizza feeds 4 people the equation would be: # of people/ 4 = number of pizzas you need.

The ratio of blue crayons to red crayons in a classroom is 32:28. The classroom has 16 blue crayons.

How many red crayons are in the classroom?

Answers

32/28=16/x
32x= 448
x=14
There are 14 red crayons in classroom

Answer:

14 red crayons

Step-by-step explanation:

since we already know the ratios of the crayons we are going to use ratio and proportion to solve our question B:R is 32:28 and they are directly proportional meaning we can scale the quantities by multiplying.32:28 and 16:R , r is the unknown quantity ,then we cross multiply  the 2 ratios to get 32R= 448, then we divide by32 both sides so we can remain with the value of R which is 14

In the given figure, the alternate interior angles are

A: 2,1
B: 2,3
C: 2,4
D: 2,5​

Answers

Answer:

Where is your attachment ?

The sum of two numbers is -12.6 identify the two negative addends that make the statement true

Answers

The sum of the two numbers = -12.6

The two negative addends that make the statement "The sum of two numbers is -12.6" true are -8.6 and -4

Let x represent the first negative number

Let y represent the second negative number

x   +  y   =   -12.6

To make the above equation to be true, assume a value f x that is negative but greater than -12.6

Let x = -8.6

Substitute x = -8.6 into the equation x + y = -12.6

-8.6  +  y   =  -12.6

Add 8.6 to both sides of the equation

-8.6  +  8.6  +  y   =  -12.6  +  8.6

y   =  -4

As a proof:

-8.6  -  4   =   -12.6

The two negative addends that make the statement "The sum of two numbers is -12.6" true are -8.6 and -4

Learn more here: https://brainly.com/question/2326415

From an elevation of 0.5 m below the surface of the water, a swimmer dives at a rate of 0.25 m/s. What is the depth of the swimmer after 4 minutes?

Answers

Answer:

gg

Step-by-step explanation:

Four students are playing a card game. They decide to choose the first person to play by each selecting a card from the 52-card deck and looking for the highest card in value and suit. They rank the suits from lowest to highest: clubs, diamonds, hearts, and spades. (a) If the card is replaced in the deck after each student chooses, how many possible configurations of the four choices are possible

Answers

Answer:

Step-by-step explanation:

Solve for x
And show work

Answers

Answer:

2x - 20 + 7 = x - 1

2x - 13 = x-1

2x = x+12

x = 12

1) Delectable Cookie Company sells chocolate chip cookies for $6.95 per pound and
white chocolate cookies for $5.95 per pound. How many pounds of chocolate chip
cookies should be mixed with 4 pounds of white chocolate cookies to obtain a mixture
that sells for $6.75 per pound?

Answers

Answer: 16lbs

Step-by-step explanation: CCC=Chocolate Chip Cookie; WCC=White Chocolate Cookie.

Set up a table showing the pricing ($/lb) and pounds (lbs) for both cookies. The total value of the WCC is $23.8 ($5.95/lb x 4 lbs). The value of the CCC is 6.95x, where x is the lbs CCC.

CCC WCC

6.95 5.95 $/lb

x 4 lbs

6.95x 23.8 $ Total value [$/lb * lbs]

We want x lbs of CCC cookies such that the total value of cookies divided by the total number of lbs is equal to $6.75/lb. That can be written as:

(6.95x + 5.95*4)/(x+4) = 6.75 [Total value of cookies divided by total weight equals $6.75]

(6.95x + 23.8)/(x+4) = 6.75

6.95x + 23.8 =6.75x + 27

0.2x = 3.2

x = 16 lbs

We need 16 lbs of CCC added to the 4 lbs of WCC for a total weight of 20 lbs and a price of $6.75/lb.

O=3, 9, 15, 21, 27, 33, 39 in set builder notation

Answers

Answer:its 6 because 3 + 6 is 9 + 6 is 15

Step-by-step explanation:

plsss someone help mee asap. Giving brainliest!!

Answers

12.2 cause sqrt150 = 12.247 which is 12.3 which would be the closest

Answer:

12.2

the answer is 12.2

using the check method

you will know I am correct


What is the slope of the line that passes through (-8, 12) and (4, 3)?

Answers

You would use (y2-y1)/(x2-x1)
(3-12)/(4+8)
Answer -3/4

With solving and it’s better to edit the photo and send it

Answers

Step-by-step explanation:

please mark me as brainlest

lcm of 120,5200 and 40​

Answers

Ok because what does this even mean

Explain how to decide whether to use graphing, substitution, or elimination to solve a system of equations.

Answers

It depends on the systems of equations. I would stay away from elimination, go for substitution and graph only if asked.

2+2x3+6=

Also what is this?

Answers

2+2x3+6=18

That happens nobody answers your question for a period of time, and so it is taken down and you get the points back

Answer:

The answer is 14

Step-by-step explanation:

Also it shows that when no one answers a question of yours.

the rives family plans to travel to the beach for a summer vacation family s pin $67.50 for 23 gallons of gasoline to the nearest cent how much money did the rives family spin per gallon on gas for the trip

Answers

Answer:

$2.93

Step-by-step explanation:

67.50/23=2.9347826087 sorry had to use 20 characters in the explanation

Answer:

$2.93

Step-by-step explanation:

$67.50 for 23 gallons

$? for 1 gallon

$67.50 ÷ 23 = $2.93478

Rounded to the nearest cent: $2.93

Consider the system of equations.

5x + 2y = 12
5x – 2y = 28

What is the solution to the system of equations? Show work using substitution or elimination to support your answer.

A (4, -4)

B (-4, 4)

C (5, -6.5)

D (4, 16)

Show how u got the answer.

Answers

Answer:

(4, -4) = (x, y) = A

Step-by-step explanation:

 5x + 2y = 12

- (5x - 2y = 28)

4y = -16

y = -4

5x + 2(-4) = 12

5x - 8 = 12

5x = 20

x = 4


help o don’t know any of theses answers please help me

Answers

Answer:

it's c

Step-by-step explanation:

c is the answer becuse its showing u that ob is perpenlicular to Ac

Name this parent function f(x)=(1)/(x+3)-5

Answers

Answer:

F(x)=IxI

Step-by-step explanation:

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