how do I factorise this?
9x²-1​

Answers

Answer 1
(3x-1)(3x+1)

Explanation:
Since they are both squared 9x^2 and 1^2
Also there is a “-“
So we use this formula to factorize :
a^2 - b^2 = ( a-b) (a+b)

Related Questions

What is the least common multiple of 24 and 9 *
3
1
72
216

Answers

Answer:

The least common multiple of 24 and 9 is 72.

Step-by-step explanation:

I hope l helped you ❤❤


Match each system of equations with its number of solutions
-8x +7y=-2
8x-7y=2

8x +7y=30
8x-7y=2

8x-7y=2
-8x+7y=2

No solution
Infinitely many solutions
1 solution

Answers

Answer:

8x + 7y = 30 ( one solution)

8x - 7y = 2

-8x + 7y = -2 ( infinitely many solutions )

8x - 7y = 2

8x - 7y = 2

-8x + 7y = 2 ( zero solutions )

Answer:

Answer:

8x + 7y = 30 ( one solution)

8x - 7y = 2

-8x + 7y = -2 ( infinitely many solutions )

8x - 7y = 2

8x - 7y = 2

-8x + 7y = 2 ( zero solutions )

Step-by-step explanation:

Solve the system of equations using substitution. Show all work.

y = 7x - 24

y = -3x + 16

Answers

7x - 24 = -3x + 16
7x = -3x + 40
10x = 40
x = 4
y = 7(4) - 24
y = 28 - 24, y = 4
Solution: x = 4, y = 4

1. Separate the number 58 into three parts so
that the second number is 2 less than the
first number which is one half the third
number.

Answers

Answer:

2nd number = 13

First number = 15

3rd number = 30

Step-by-step explanation:

Let

2nd number = 1/2x - 2

First number = 1/2x

3rd number = x

Total = 58

x + 1/2x + 1/2x - 2 = 58

x + x+x/2 = 58 + 2

x + 2/2x = 60

x + x = 60

2x = 60

x = 60/2

= 30

x = 30

2nd number = 1/2x - 2

= 1/2*30 - 2

= 15 - 2

= 13

First number = 1/2x

= 1/2*30

= 15

3rd number = x

= 30

Can anyone help me with this Midterm Advanced Algebra problem (DONT ANSWER IF YOUR NOT SURE)

Answers

The pair of lines are parallel :)
These are parallel lines.

Write an expression for the length of the third side of an isocoles triangle

Answers

Answer:

[tex]y = 180 - 2x[/tex]

Step-by-step explanation:

Required

Triangle: Isosceles

Required

An expression for the third side

Let the equal sides be x and the third side be y

From triangle sum theorem, we have the following expression:

[tex]x + x + y = 180[/tex]

[tex]2x + y = 180[/tex]

Subtract 2x from both sides

[tex]-2x +2x + y = 180 - 2x[/tex]

[tex]y = 180 - 2x[/tex]

Hence, the third side of an isosceles triangle is: [tex]y = 180 - 2x[/tex]

PLEASE HELP GIVING BRAINLEST it’s due in a few minutes please help!!

-34, -64,-94,-124, find the 7th and 8th number in the sequence.

Answers

Answer:

what ever the 5th number was -30

Step-by-step explanation:

its subtracting 30 each step

0.2% of 16

Pls show work.

Answers

Answer:

0.512

Step-by-step explanation:

0.2%x16=0.032

0.032x16= 0.512

Select all the expressions that have a value of 40 when x = 10.8.
4,320 ÷ x

Answers

Answer: Option C.

Step-by-step explanation:

x = 10.8

A. = 4,320 ÷ x

= 4,320/10.8

= 400

Option A is incorrect.

B. = 288/x + 16

= 288/10.8 + 16

= 42.7

Option B is incorrect

C. = (x² ÷ 18) + 33.52

= (10.8² ÷ 18) + 33.52

= 40

Option C is correct

D. = (1,752 ÷ x) – 162/29

= (1,752 ÷ 10.8) – 162/29

= 156.6

Option D is incorrect

E. = x/12 + 36

= 10.8/12 + 36

= 36.9

Option E is incorrect

Answer:

x = 10.8

432 ÷ x = 40

(216 ÷ x) + 20 = 40

(108 ÷ x) + 30 = 40

(54 ÷ x) + 35 = 40

Step-by-step explanation:

The graph of fx) is shown.
Over which interval on the x-axis is there a negative rate of change in the function?
0-2 to-1
O1.5to 0.5
0 to 1
O 0.5 to 1.5

Answers

You didn’t post the graph

Answer:

heres the graph

Step-by-step explanation:

Which pair of rectangles are similar

Answers

Answer:

Its 2nd one

Step-by-step explanation:

189÷90=2.1

81÷90=0.9

-4 + x _< 9 simplify

Answers

Answer: x = 13

Step-by-step explanation:

Answer:

1 Let x=10x=10.

10-9=110−9=1

2 Simplify  10-910−9  to  11.

1=11=1

HELP!!
Mr. Wood bought BART tickets for his class field trip. If 40 tickets costed 60 dollars, how much did 15 tickets cost? *

Answers

Answer:

22.5

Step-by-step explanation:

Each ticket costs 1

Answer:

$22.50 for 15 tickets

Step-by-step explanation:

$60 divided by 40 = $1.50 per ticket

$1.50 x 15= $22.50

Can y’all please help me!!

Answers

Answer:tyler = 1.5 meters in 1 second

Step-by-step explanation:

Please help.
Write a situation that can be represented with this graph. ​

Answers

Ion know sorry buddy I wish I could help

4. At the local pet store, zebra fish cost $2.10 each and neon tetras cost $1.85 each. If Marsha bought
13 fish for a total cost of $25.80, not including tax, how many of each type of fish did she buy?

a) Write systems of equations to describe the situation,

B) solve the system

c) How many of each of fish did she buy


Please explain!!

Answers

2.10x + 1.58y = 25.80
x+y = 13

Who knows how to do this I TRULY NEED HELP

Answers

Answer: The answer is #3

Step-by-step explanation:

PLZ help geometry proof. Will give Brainlyiest I’ve posted question 3 times so you can get triple the points

Answers

Answer:

The two column proof can be presented as follows;

Statement                     [tex]{}[/tex]                   Reason

1. p║q                    [tex]{}[/tex]                        Given

∠1 ≅ ∠11

2. ∠1 ≅ ∠9                     [tex]{}[/tex]               Corresponding angles on parallel lines

3. ∠9 ≅ ∠11                    [tex]{}[/tex]               Transitive property of equality

4. a║b                    [tex]{}[/tex]                       Corresponding angles on parallel lines are congruent

Step-by-step explanation:

The statements in the two column proof can be explained as follows;

Statement                     [tex]{}[/tex]                Explanation

1. p║q                    [tex]{}[/tex]                        Given

∠1 ≅ ∠11

2. ∠1 ≅ ∠9                     [tex]{}[/tex]               Corresponding angles on parallel lines crossed by a common transversal are congruent

3. ∠9 ≅ ∠11                    [tex]{}[/tex]               Transitive property of equality

Given that ∠1 ≅ ∠11 and we have that ∠1 ≅ ∠9, then we can transit the terms between the two expressions to get, ∠9 ≅ ∠11 which is the same as ∠11 ≅ ∠9

4. a║b                    [tex]{}[/tex]                       Corresponding angles on parallel lines are congruent

Whereby we now have ∠9 which is formed by line a and the transversal line q, is congruent to ∠11 which is formed by line b and the common transversal line q, and both ∠9 and ∠11 occupy corresponding locations on lines a and b respectively which are crossed by the transversal, line q, then lines a and b are parallel to each other or a║b.

Describe what a frequency table is what is used for

Answers

Answer:

A frequency table shows the distribution of observations based on the options in a variable. Frequency tables are helpful to understand which options occur more or less often in the dataset. This is helpful for getting a better understanding of each variable and deciding if variables need to be recoded or not.

Step-by-step explanation:

hope this helps! :)

The usage of frequency table is to create graphs such as histograms, bar charts, and pie charts to visualize the data.

We are given that;

The frequency table

Now,

A frequency table is a table that lists items and shows the number of times the items occur. It is a way of organizing data and summarizing how often each value or category appears in a dataset.

Frequency tables can be used for any type of variable, such as categorical, ordinal, or numerical.

Frequency tables can help us to understand the distribution of data, identify patterns, and compare different groups.

For example, suppose we have a dataset of 20 students' favorite colors. We can make a frequency table to show how many students prefer each color:

| Color | Frequency |

| ----- | ---------    |

| Red   | 5         |

| Blue  | 7         |

| Green | 4       |

| Yellow| 2       |

| Pink  | 2         |

Therefore, by the table answer will be to create graphs such as histograms, bar charts, and pie charts to visualize the data.

Learn more about table here:

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Solve for x and find the missing angles
C
B
(8x - 1)º
)
((4x + 7°
A

Answers

Answer:

x=7

Step-by-step explanation:

A^+B^+C^=180° (sum of int. angles on triangle)

4x+7+8x-1+90=180

12x=180-96

12x/12=84/12

x=7

8.3x2 +0.9xy + 3.6
7.4x2 - 1.7xy + 6.4

Answers

Answer:

20.2 + 0.9xy

      &

20.2-1.7xy

Step-by-step explanation:

can I have the answer (15 points)​

Answers

N=9..................

A tree has a shadow 900 inches long. At the same time of day, Evelyn's shadow is 72 inches long. The two triangles formed by the tree, Evelyn, and their shadows are similar right triangles, as shown in the diagram below.
Evelyn is 65 inches tall. What is the height of the tree in inches?

Answers

Answer:

812.5 inches

Step-by-step explanation:

Turn these numbers into fractions:

[tex]\frac{h}{900} \frac{65}{72}[/tex]

Solve 900/72 to get 12.5. This means that multiplying 72 x 12.5, you get 900. So, to find the height of the tree: h you multiply 65 x 12.5. Your answer to this is 812.5.

Hope it helps!

Answer thanks a lot, I’m confused on what to put.

Answers

Step-by-step explanation:

2 < (-2x + 4) and (-2x + 4) > -14

=> -2x + 4 > 2

=> -2x > -2

=> x < 1.

Find the percent decrease. Round to the nearest percent.
From 153 pounds to 145 pounds

Answers

I believe the answer is a 5.22876% decrease

5%

Step-by-step explanation:

Hope this helps!

Ricky bought an apple and a bottle of
juice for $3. Noel bought 3 apples and a
bottle of juice for $7. How much is a bottle of juice?

Answers

Answer:

The juice is 1 dollar

2+1= 3

2+2+2+1=7

hoped this helped

Answer:

The juice is worth $2.50

Step-by-step explanation:

7$- 3$ = 4$

1.50 *3 = 4.50

4.5 + 2.50 = 7

The apples are worth a $1.50

I hope this helps you!

Select all systems of equations that have no solutions.
A. y=5-3x
y=-3x+4

B. Y=4x-1
4y=16x-4

C.5x-2y=3
10x-4y=6

D.3x+7y=42
6x+14y=50

E. Y=5+2x
Y=5x*2

Answers

A. and D.

-this is because they are parallel, or never intersect whereas the others will cross eachother at some point. Also, you can google Desmos Graphing Calculator and type the equations onto it to help find the answer, i recommend.

The system of equation which have no solution are A, B and D.

What is a slope ?

Slope defines rate of change or we can also say it is rise over run.

According to the given question we have to determine given system of equations which have no solution.

We know when two lines are parallel to each other they have no solution cause they have no common intersection points and we also know parallel lines have same slope with different y intercept.

Let us write all the system of equations in slope intercept form which is

y = mx + b.

A.

y = -3x + 5.

y = -3x + 4.

This system of equation has no solution cause have have same slope and different y intercept hence parallel to each other.

B.

y = 4x - 1.

4y = 16x - 1

y = 4x - 1/4.

Same slope different y intercept so no solution.

C.

-2y = -5x + 3.

y = (5/2)x - 3/2.

-4y = -10x + 6.

y = (5/2)x - 3/2.

Same slope same y intercept so they are on top of another so infinite no. of solutions.

D.

3x + 7y = 42

7y = - 3x + 42.

y = (-3/7)x + 6.

14y = -6x + 50.

y = (-3/7)x + 25/7.

Same slope different y intercept so they are parallel to each other.

E.

y =2x + 5.

y = 5x².

Different slope and y intercept so they are not parallel.

learn more about slope here :

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2,610 rounded to the nearest ten

Answers

Answer:

2,610 rounded is still 2,610

i need the length of c in the triangle shown. plz i need help badly.

Answers

Answer:

c=10

Step-by-step explanation:

6^2+8^2=c^2

36+64=c^2

100=c^2

10=c

The graph shows the relationship between time, in hours, and the population, in thousands of a culture of bacteria. y 45 40 35 30 Population 25 20 15 10 5 0 1 2 3 4 5 6 7 8 9* Time (hours) Which statement describes the meaning of the point (0,10) on the graph? O A. After 10 hours, there are 10,000 bacteria. B. After 10 hours, there are no more bacteria. C. The population began with 10,000 bacteria. D. The population is multiplying itself by 10 each hour.​

Answers

Answer:

The answer is c.) The population began with 10,000 bacteria!!!

Step-by-step explanation:

Becouse if you find the equation with( -5) you will match it up to (25) and there for the answer c.) is correct!!!

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